[syzbot] [net?] [nfc?] KMSAN: uninit-value in nci_rx_work

[syzbot] [net?] [nfc?] KMSAN: uninit-value in nci_rx_work

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    861deac3b092 Linux 6.7-rc7
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=136a5231e80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e0c7078a6b901aa3
dashboard link: https://syzkaller.appspot.com/bug?extid=d7b4dc6cd50410152534
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=111729e9e80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1018379ee80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0ea60ee8ed32/disk-861deac3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6d69fdc33021/vmlinux-861deac3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f0158750d452/bzImage-861deac3.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d7b4dc6cd50410152534@syzkaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in nci_rx_work+0x2e6/0x500 net/nfc/nci/core.c:1516
 nci_rx_work+0x2e6/0x500 net/nfc/nci/core.c:1516
 process_one_work kernel/workqueue.c:2627 [inline]
 process_scheduled_works+0x104e/0x1e70 kernel/workqueue.c:2700
 worker_thread+0xf45/0x1490 kernel/workqueue.c:2781
 kthread+0x3ed/0x540 kernel/kthread.c:388
 ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

Uninit was created at:
 slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768
 slab_alloc_node mm/slub.c:3478 [inline]
 kmem_cache_alloc_node+0x5e9/0xb10 mm/slub.c:3523
 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:560
 __alloc_skb+0x318/0x740 net/core/skbuff.c:651
 alloc_skb include/linux/skbuff.h:1286 [inline]
 virtual_ncidev_write+0x6d/0x280 drivers/nfc/virtual_ncidev.c:120
 vfs_write+0x561/0x1490 fs/read_write.c:582
 ksys_write+0x20f/0x4c0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x93/0xd0 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

CPU: 0 PID: 743 Comm: kworker/u4:5 Not tainted 6.7.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Workqueue: nfc2_nci_rx_wq nci_rx_work
=====================================================


---
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Re: [syzbot] [PATCH net] nfc: nci: Fix uninit-value in nci_rx_work

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***

Subject: [PATCH net] nfc: nci: Fix uninit-value in nci_rx_work
Author: ryasuoka@redhat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 58c806d867bf265c6fd16fc3bc62e2d3c156b5c9 


diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 0d26c8ec9993..b7a020484131 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -1516,7 +1516,7 @@ static void nci_rx_work(struct work_struct *work)
                nfc_send_to_raw_sock(ndev->nfc_dev, skb,
                                     RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);

-               if (!nci_plen(skb->data)) {
+               if (!skb->len || !nci_plen(skb->data)) {
                        kfree_skb(skb);
                        break;
                }

Re: [syzbot] [PATCH net] nfc: nci: Fix uninit-value in nci_rx_work

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Subject: [PATCH net] nfc: nci: Fix uninit-value in nci_rx_work
Author: ryasuoka@redhat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 58c806d867bf265c6fd16fc3bc62e2d3c156b5c9

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 0d26c8ec9993..b7a020484131 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -1516,7 +1516,7 @@ static void nci_rx_work(struct work_struct *work)
 		nfc_send_to_raw_sock(ndev->nfc_dev, skb,
 				     RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
 
-		if (!nci_plen(skb->data)) {
+		if (!skb->len || !nci_plen(skb->data)) {
 			kfree_skb(skb);
 			break;
 		}

Re: [syzbot] [PATCH net] nfc: nci: Fix uninit-value in nci_rx_work

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Subject: [PATCH net] nfc: nci: Fix uninit-value in nci_rx_work
Author: ryasuoka@redhat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 58c806d867bf265c6fd16fc3bc62e2d3c156b5c9

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index cdad47b140fa..b7a020484131 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -1516,6 +1516,11 @@ static void nci_rx_work(struct work_struct *work)
 		nfc_send_to_raw_sock(ndev->nfc_dev, skb,
 				     RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
 
+		if (!skb->len || !nci_plen(skb->data)) {
+			kfree_skb(skb);
+			break;
+		}
+
 		/* Process frame */
 		switch (nci_mt(skb->data)) {
 		case NCI_MT_RSP_PKT:

Re: [syzbot] [PATCH net] nfc: nci: Fix uninit-value in nci_rx_work

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Subject: [PATCH net] nfc: nci: Fix uninit-value in nci_rx_work
Author: ryasuoka@redhat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 0d26c8ec9993..b7a020484131 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -1516,7 +1516,7 @@ static void nci_rx_work(struct work_struct *work)
 		nfc_send_to_raw_sock(ndev->nfc_dev, skb,
 				     RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
 
-		if (!nci_plen(skb->data)) {
+		if (!skb->len || !nci_plen(skb->data)) {
 			kfree_skb(skb);
 			break;
 		}

Re: [syzbot] [PATCH net v2] nfc: nci: Fix uninit-value in nci_rx_work

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Subject: [PATCH net v2] nfc: nci: Fix uninit-value in nci_rx_work
Author: ryasuoka@redhat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 0d26c8ec9993..ab07b5f69664 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -1463,6 +1463,16 @@ int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode,
 				 ndev->ops->n_core_ops);
 }
 
+static bool nci_valid_size(struct sk_buff *skb, unsigned int header_size)
+{
+	if (skb->len < header_size ||
+	    !nci_plen(skb->data) ||
+	    skb->len < header_size + nci_plen(skb->data)) {
+		return false;
+	}
+	return true;
+}
+
 /* ---- NCI TX Data worker thread ---- */
 
 static void nci_tx_work(struct work_struct *work)
@@ -1516,30 +1526,36 @@ static void nci_rx_work(struct work_struct *work)
 		nfc_send_to_raw_sock(ndev->nfc_dev, skb,
 				     RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
 
-		if (!nci_plen(skb->data)) {
-			kfree_skb(skb);
-			break;
-		}
+		if (!skb->len)
+			goto invalid_pkt_free;
 
 		/* Process frame */
 		switch (nci_mt(skb->data)) {
 		case NCI_MT_RSP_PKT:
+			if (!nci_valid_size(skb, NCI_CTRL_HDR_SIZE))
+				goto invalid_pkt_free;
 			nci_rsp_packet(ndev, skb);
 			break;
 
 		case NCI_MT_NTF_PKT:
+			if (!nci_valid_size(skb, NCI_CTRL_HDR_SIZE))
+				goto invalid_pkt_free;
 			nci_ntf_packet(ndev, skb);
 			break;
 
 		case NCI_MT_DATA_PKT:
+			if (!nci_valid_size(skb, NCI_DATA_HDR_SIZE))
+				goto invalid_pkt_free;
 			nci_rx_data_packet(ndev, skb);
 			break;
 
 		default:
 			pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
-			kfree_skb(skb);
-			break;
+			goto invalid_pkt_free;
 		}
+invalid_pkt_free:
+		kfree_skb(skb);
+		break;
 	}
 
 	/* check if a data exchange timeout has occurred */

Re: [syzbot] [PATCH net v2] nfc: nci: Fix uninit-value in nci_rx_work

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Subject: [PATCH net v2] nfc: nci: Fix uninit-value in nci_rx_work
Author: ryasuoka@redhat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 0d26c8ec9993..ab07b5f69664 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -1463,6 +1463,16 @@ int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode,
 				 ndev->ops->n_core_ops);
 }
 
+static bool nci_valid_size(struct sk_buff *skb, unsigned int header_size)
+{
+	if (skb->len < header_size ||
+	    !nci_plen(skb->data) ||
+	    skb->len < header_size + nci_plen(skb->data)) {
+		return false;
+	}
+	return true;
+}
+
 /* ---- NCI TX Data worker thread ---- */
 
 static void nci_tx_work(struct work_struct *work)
@@ -1516,30 +1526,36 @@ static void nci_rx_work(struct work_struct *work)
 		nfc_send_to_raw_sock(ndev->nfc_dev, skb,
 				     RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
 
-		if (!nci_plen(skb->data)) {
-			kfree_skb(skb);
-			break;
-		}
+		if (!skb->len)
+			goto invalid_pkt_free;
 
 		/* Process frame */
 		switch (nci_mt(skb->data)) {
 		case NCI_MT_RSP_PKT:
+			if (!nci_valid_size(skb, NCI_CTRL_HDR_SIZE))
+				goto invalid_pkt_free;
 			nci_rsp_packet(ndev, skb);
 			break;
 
 		case NCI_MT_NTF_PKT:
+			if (!nci_valid_size(skb, NCI_CTRL_HDR_SIZE))
+				goto invalid_pkt_free;
 			nci_ntf_packet(ndev, skb);
 			break;
 
 		case NCI_MT_DATA_PKT:
+			if (!nci_valid_size(skb, NCI_DATA_HDR_SIZE))
+				goto invalid_pkt_free;
 			nci_rx_data_packet(ndev, skb);
 			break;
 
 		default:
 			pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
-			kfree_skb(skb);
-			break;
+			goto invalid_pkt_free;
 		}
+invalid_pkt_free:
+		kfree_skb(skb);
+		break;
 	}
 
 	/* check if a data exchange timeout has occurred */

Re: [syzbot] [PATCH net v3] nfc: nci: Fix uninit-value in nci_rx_work

[syzbot]

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Subject: [PATCH net v3] nfc: nci: Fix uninit-value in nci_rx_work
Author: ryasuoka@redhat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 0d26c8ec9993..e4f92a090022 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -1463,6 +1463,16 @@ int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode,
 				 ndev->ops->n_core_ops);
 }
 
+static bool nci_valid_size(struct sk_buff *skb, unsigned int header_size)
+{
+	if (skb->len < header_size ||
+	    !nci_plen(skb->data) ||
+	    skb->len < header_size + nci_plen(skb->data)) {
+		return false;
+	}
+	return true;
+}
+
 /* ---- NCI TX Data worker thread ---- */
 
 static void nci_tx_work(struct work_struct *work)
@@ -1516,30 +1526,35 @@ static void nci_rx_work(struct work_struct *work)
 		nfc_send_to_raw_sock(ndev->nfc_dev, skb,
 				     RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
 
-		if (!nci_plen(skb->data)) {
-			kfree_skb(skb);
-			break;
-		}
+		if (!skb->len)
+			goto invalid_pkt_free;
 
 		/* Process frame */
 		switch (nci_mt(skb->data)) {
 		case NCI_MT_RSP_PKT:
+			if (!nci_valid_size(skb, NCI_CTRL_HDR_SIZE))
+				goto invalid_pkt_free;
 			nci_rsp_packet(ndev, skb);
-			break;
+			continue;
 
 		case NCI_MT_NTF_PKT:
+			if (!nci_valid_size(skb, NCI_CTRL_HDR_SIZE))
+				goto invalid_pkt_free;
 			nci_ntf_packet(ndev, skb);
-			break;
+			continue;
 
 		case NCI_MT_DATA_PKT:
+			if (!nci_valid_size(skb, NCI_DATA_HDR_SIZE))
+				goto invalid_pkt_free;
 			nci_rx_data_packet(ndev, skb);
-			break;
+			continue;
 
 		default:
 			pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
-			kfree_skb(skb);
-			break;
+			goto invalid_pkt_free;
 		}
+invalid_pkt_free:
+		kfree_skb(skb);
 	}
 
 	/* check if a data exchange timeout has occurred */

Re: [syzbot] [PATCH net v3] nfc: nci: Fix uninit-value in nci_rx_work

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

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Subject: [PATCH net v3] nfc: nci: Fix uninit-value in nci_rx_work
Author: ryasuoka@redhat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e88c4cfcb7b888ac374916806f86c17d8ecaeb67

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 0d26c8ec9993..e4f92a090022 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -1463,6 +1463,16 @@ int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode,
 				 ndev->ops->n_core_ops);
 }
 
+static bool nci_valid_size(struct sk_buff *skb, unsigned int header_size)
+{
+	if (skb->len < header_size ||
+	    !nci_plen(skb->data) ||
+	    skb->len < header_size + nci_plen(skb->data)) {
+		return false;
+	}
+	return true;
+}
+
 /* ---- NCI TX Data worker thread ---- */
 
 static void nci_tx_work(struct work_struct *work)
@@ -1516,30 +1526,35 @@ static void nci_rx_work(struct work_struct *work)
 		nfc_send_to_raw_sock(ndev->nfc_dev, skb,
 				     RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
 
-		if (!nci_plen(skb->data)) {
-			kfree_skb(skb);
-			break;
-		}
+		if (!skb->len)
+			goto invalid_pkt_free;
 
 		/* Process frame */
 		switch (nci_mt(skb->data)) {
 		case NCI_MT_RSP_PKT:
+			if (!nci_valid_size(skb, NCI_CTRL_HDR_SIZE))
+				goto invalid_pkt_free;
 			nci_rsp_packet(ndev, skb);
-			break;
+			continue;
 
 		case NCI_MT_NTF_PKT:
+			if (!nci_valid_size(skb, NCI_CTRL_HDR_SIZE))
+				goto invalid_pkt_free;
 			nci_ntf_packet(ndev, skb);
-			break;
+			continue;
 
 		case NCI_MT_DATA_PKT:
+			if (!nci_valid_size(skb, NCI_DATA_HDR_SIZE))
+				goto invalid_pkt_free;
 			nci_rx_data_packet(ndev, skb);
-			break;
+			continue;
 
 		default:
 			pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
-			kfree_skb(skb);
-			break;
+			goto invalid_pkt_free;
 		}
+invalid_pkt_free:
+		kfree_skb(skb);
 	}
 
 	/* check if a data exchange timeout has occurred */

Re: [syzbot] [PATCH net v4] nfc: nci: Fix uninit-value in nci_rx_work

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: [PATCH net v4] nfc: nci: Fix uninit-value in nci_rx_work
Author: ryasuoka@redhat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git master

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index b133dc55304c..cd2d54168a8e 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -1463,6 +1463,16 @@ int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode,
 				 ndev->ops->n_core_ops);
 }
 
+static bool nci_valid_size(struct sk_buff *skb, unsigned int header_size)
+{
+	if (skb->len < header_size ||
+	    !nci_plen(skb->data) ||
+	    skb->len < header_size + nci_plen(skb->data)) {
+		return false;
+	}
+	return true;
+}
+
 /* ---- NCI TX Data worker thread ---- */
 
 static void nci_tx_work(struct work_struct *work)
@@ -1516,23 +1526,34 @@ static void nci_rx_work(struct work_struct *work)
 		nfc_send_to_raw_sock(ndev->nfc_dev, skb,
 				     RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
 
-		if (!nci_plen(skb->data)) {
+		if (!skb->len) {
 			kfree_skb(skb);
-			kcov_remote_stop();
-			break;
+			continue;
 		}
 
 		/* Process frame */
 		switch (nci_mt(skb->data)) {
 		case NCI_MT_RSP_PKT:
+			if (!nci_valid_size(skb, NCI_CTRL_HDR_SIZE)) {
+				kfree_skb(skb);
+				break;
+			}
 			nci_rsp_packet(ndev, skb);
 			break;
 
 		case NCI_MT_NTF_PKT:
+			if (!nci_valid_size(skb, NCI_CTRL_HDR_SIZE)) {
+				kfree_skb(skb);
+				break;
+			}
 			nci_ntf_packet(ndev, skb);
 			break;
 
 		case NCI_MT_DATA_PKT:
+			if (!nci_valid_size(skb, NCI_DATA_HDR_SIZE)) {
+				kfree_skb(skb);
+				break;
+			}
 			nci_rx_data_packet(ndev, skb);
 			break;
 

Re: [syzbot] [PATCH net v4] nfc: nci: Fix uninit-value in nci_rx_work

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Subject: [PATCH net v4] nfc: nci: Fix uninit-value in nci_rx_work
Author: ryasuoka@redhat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git master

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index b133dc55304c..0aaff30cb68f 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -1463,6 +1463,16 @@ int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode,
 				 ndev->ops->n_core_ops);
 }
 
+static bool nci_valid_size(struct sk_buff *skb, unsigned int header_size)
+{
+	if (skb->len < header_size ||
+	    !nci_plen(skb->data) ||
+	    skb->len < header_size + nci_plen(skb->data)) {
+		return false;
+	}
+	return true;
+}
+
 /* ---- NCI TX Data worker thread ---- */
 
 static void nci_tx_work(struct work_struct *work)
@@ -1516,24 +1526,32 @@ static void nci_rx_work(struct work_struct *work)
 		nfc_send_to_raw_sock(ndev->nfc_dev, skb,
 				     RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
 
-		if (!nci_plen(skb->data)) {
+		if (!skb->len) {
 			kfree_skb(skb);
-			kcov_remote_stop();
-			break;
+			continue;
 		}
 
 		/* Process frame */
 		switch (nci_mt(skb->data)) {
 		case NCI_MT_RSP_PKT:
-			nci_rsp_packet(ndev, skb);
+			if (nci_valid_size(skb, NCI_CTRL_HDR_SIZE))
+				nci_rsp_packet(ndev, skb);
+			else
+				kfree_skb(skb);
 			break;
 
 		case NCI_MT_NTF_PKT:
-			nci_ntf_packet(ndev, skb);
+			if (nci_valid_size(skb, NCI_CTRL_HDR_SIZE))
+				nci_ntf_packet(ndev, skb);
+			else
+				kfree_skb(skb);
 			break;
 
 		case NCI_MT_DATA_PKT:
-			nci_rx_data_packet(ndev, skb);
+			if (nci_valid_size(skb, NCI_DATA_HDR_SIZE))
+				nci_rx_data_packet(ndev, skb);
+			else
+				kfree_skb(skb);
 			break;
 
 		default:

Re: [syzbot] [PATCH net v4] nfc: nci: Fix uninit-value in nci_rx_work

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com.

***

Subject: [PATCH net v4] nfc: nci: Fix uninit-value in nci_rx_work
Author: ryasuoka@redhat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git main

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index b133dc55304c..0aaff30cb68f 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -1463,6 +1463,16 @@ int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode,
 				 ndev->ops->n_core_ops);
 }
 
+static bool nci_valid_size(struct sk_buff *skb, unsigned int header_size)
+{
+	if (skb->len < header_size ||
+	    !nci_plen(skb->data) ||
+	    skb->len < header_size + nci_plen(skb->data)) {
+		return false;
+	}
+	return true;
+}
+
 /* ---- NCI TX Data worker thread ---- */
 
 static void nci_tx_work(struct work_struct *work)
@@ -1516,24 +1526,32 @@ static void nci_rx_work(struct work_struct *work)
 		nfc_send_to_raw_sock(ndev->nfc_dev, skb,
 				     RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
 
-		if (!nci_plen(skb->data)) {
+		if (!skb->len) {
 			kfree_skb(skb);
-			kcov_remote_stop();
-			break;
+			continue;
 		}
 
 		/* Process frame */
 		switch (nci_mt(skb->data)) {
 		case NCI_MT_RSP_PKT:
-			nci_rsp_packet(ndev, skb);
+			if (nci_valid_size(skb, NCI_CTRL_HDR_SIZE))
+				nci_rsp_packet(ndev, skb);
+			else
+				kfree_skb(skb);
 			break;
 
 		case NCI_MT_NTF_PKT:
-			nci_ntf_packet(ndev, skb);
+			if (nci_valid_size(skb, NCI_CTRL_HDR_SIZE))
+				nci_ntf_packet(ndev, skb);
+			else
+				kfree_skb(skb);
 			break;
 
 		case NCI_MT_DATA_PKT:
-			nci_rx_data_packet(ndev, skb);
+			if (nci_valid_size(skb, NCI_DATA_HDR_SIZE))
+				nci_rx_data_packet(ndev, skb);
+			else
+				kfree_skb(skb);
 			break;
 
 		default:

Re: [syzbot] [PATCH net v4] nfc: nci: Fix uninit-value in nci_rx_work

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: [PATCH net v4] nfc: nci: Fix uninit-value in nci_rx_work
Author: ryasuoka@redhat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git main

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index b133dc55304c..cd2d54168a8e 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -1463,6 +1463,16 @@ int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode,
 				 ndev->ops->n_core_ops);
 }
 
+static bool nci_valid_size(struct sk_buff *skb, unsigned int header_size)
+{
+	if (skb->len < header_size ||
+	    !nci_plen(skb->data) ||
+	    skb->len < header_size + nci_plen(skb->data)) {
+		return false;
+	}
+	return true;
+}
+
 /* ---- NCI TX Data worker thread ---- */
 
 static void nci_tx_work(struct work_struct *work)
@@ -1516,23 +1526,34 @@ static void nci_rx_work(struct work_struct *work)
 		nfc_send_to_raw_sock(ndev->nfc_dev, skb,
 				     RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
 
-		if (!nci_plen(skb->data)) {
+		if (!skb->len) {
 			kfree_skb(skb);
-			kcov_remote_stop();
-			break;
+			continue;
 		}
 
 		/* Process frame */
 		switch (nci_mt(skb->data)) {
 		case NCI_MT_RSP_PKT:
+			if (!nci_valid_size(skb, NCI_CTRL_HDR_SIZE)) {
+				kfree_skb(skb);
+				break;
+			}
 			nci_rsp_packet(ndev, skb);
 			break;
 
 		case NCI_MT_NTF_PKT:
+			if (!nci_valid_size(skb, NCI_CTRL_HDR_SIZE)) {
+				kfree_skb(skb);
+				break;
+			}
 			nci_ntf_packet(ndev, skb);
 			break;
 
 		case NCI_MT_DATA_PKT:
+			if (!nci_valid_size(skb, NCI_DATA_HDR_SIZE)) {
+				kfree_skb(skb);
+				break;
+			}
 			nci_rx_data_packet(ndev, skb);
 			break;
 

Re: [syzbot] [PATCH net v4] nfc: nci: Fix uninit-value in nci_rx_work

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: [PATCH net v4] nfc: nci: Fix uninit-value in nci_rx_work
Author: ryasuoka@redhat.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git main

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index b133dc55304c..0aaff30cb68f 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -1463,6 +1463,16 @@ int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode,
 				 ndev->ops->n_core_ops);
 }
 
+static bool nci_valid_size(struct sk_buff *skb, unsigned int header_size)
+{
+	if (skb->len < header_size ||
+	    !nci_plen(skb->data) ||
+	    skb->len < header_size + nci_plen(skb->data)) {
+		return false;
+	}
+	return true;
+}
+
 /* ---- NCI TX Data worker thread ---- */
 
 static void nci_tx_work(struct work_struct *work)
@@ -1516,24 +1526,32 @@ static void nci_rx_work(struct work_struct *work)
 		nfc_send_to_raw_sock(ndev->nfc_dev, skb,
 				     RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
 
-		if (!nci_plen(skb->data)) {
+		if (!skb->len) {
 			kfree_skb(skb);
-			kcov_remote_stop();
-			break;
+			continue;
 		}
 
 		/* Process frame */
 		switch (nci_mt(skb->data)) {
 		case NCI_MT_RSP_PKT:
-			nci_rsp_packet(ndev, skb);
+			if (nci_valid_size(skb, NCI_CTRL_HDR_SIZE))
+				nci_rsp_packet(ndev, skb);
+			else
+				kfree_skb(skb);
 			break;
 
 		case NCI_MT_NTF_PKT:
-			nci_ntf_packet(ndev, skb);
+			if (nci_valid_size(skb, NCI_CTRL_HDR_SIZE))
+				nci_ntf_packet(ndev, skb);
+			else
+				kfree_skb(skb);
 			break;
 
 		case NCI_MT_DATA_PKT:
-			nci_rx_data_packet(ndev, skb);
+			if (nci_valid_size(skb, NCI_DATA_HDR_SIZE))
+				nci_rx_data_packet(ndev, skb);
+			else
+				kfree_skb(skb);
 			break;
 
 		default: