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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, Pavel Skripkin <paskripkin@gmail.com>,
	Marc Kleine-Budde <mkl@pengutronix.de>
Subject: [PATCH 4.14 23/38] can: esd_usb2: fix memory leak
Date: Mon,  2 Aug 2021 15:44:45 +0200	[thread overview]
Message-ID: <20210802134335.562132140@linuxfoundation.org> (raw)
In-Reply-To: <20210802134334.835358048@linuxfoundation.org>

From: Pavel Skripkin <paskripkin@gmail.com>

commit 928150fad41ba16df7fcc9f7f945747d0f56cbb6 upstream.

In esd_usb2_setup_rx_urbs() MAX_RX_URBS coherent buffers are allocated
and there is nothing, that frees them:

1) In callback function the urb is resubmitted and that's all
2) In disconnect function urbs are simply killed, but URB_FREE_BUFFER
   is not set (see esd_usb2_setup_rx_urbs) and this flag cannot be used
   with coherent buffers.

So, all allocated buffers should be freed with usb_free_coherent()
explicitly.

Side note: This code looks like a copy-paste of other can drivers. The
same patch was applied to mcba_usb driver and it works nice with real
hardware. There is no change in functionality, only clean-up code for
coherent buffers.

Fixes: 96d8e90382dc ("can: Add driver for esd CAN-USB/2 device")
Link: https://lore.kernel.org/r/b31b096926dcb35998ad0271aac4b51770ca7cc8.1627404470.git.paskripkin@gmail.com
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/can/usb/esd_usb2.c |   16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

--- a/drivers/net/can/usb/esd_usb2.c
+++ b/drivers/net/can/usb/esd_usb2.c
@@ -207,6 +207,8 @@ struct esd_usb2 {
 	int net_count;
 	u32 version;
 	int rxinitdone;
+	void *rxbuf[MAX_RX_URBS];
+	dma_addr_t rxbuf_dma[MAX_RX_URBS];
 };
 
 struct esd_usb2_net_priv {
@@ -556,6 +558,7 @@ static int esd_usb2_setup_rx_urbs(struct
 	for (i = 0; i < MAX_RX_URBS; i++) {
 		struct urb *urb = NULL;
 		u8 *buf = NULL;
+		dma_addr_t buf_dma;
 
 		/* create a URB, and a buffer for it */
 		urb = usb_alloc_urb(0, GFP_KERNEL);
@@ -565,7 +568,7 @@ static int esd_usb2_setup_rx_urbs(struct
 		}
 
 		buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL,
-					 &urb->transfer_dma);
+					 &buf_dma);
 		if (!buf) {
 			dev_warn(dev->udev->dev.parent,
 				 "No memory left for USB buffer\n");
@@ -573,6 +576,8 @@ static int esd_usb2_setup_rx_urbs(struct
 			goto freeurb;
 		}
 
+		urb->transfer_dma = buf_dma;
+
 		usb_fill_bulk_urb(urb, dev->udev,
 				  usb_rcvbulkpipe(dev->udev, 1),
 				  buf, RX_BUFFER_SIZE,
@@ -585,8 +590,12 @@ static int esd_usb2_setup_rx_urbs(struct
 			usb_unanchor_urb(urb);
 			usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
 					  urb->transfer_dma);
+			goto freeurb;
 		}
 
+		dev->rxbuf[i] = buf;
+		dev->rxbuf_dma[i] = buf_dma;
+
 freeurb:
 		/* Drop reference, USB core will take care of freeing it */
 		usb_free_urb(urb);
@@ -674,6 +683,11 @@ static void unlink_all_urbs(struct esd_u
 	int i, j;
 
 	usb_kill_anchored_urbs(&dev->rx_submitted);
+
+	for (i = 0; i < MAX_RX_URBS; ++i)
+		usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
+				  dev->rxbuf[i], dev->rxbuf_dma[i]);
+
 	for (i = 0; i < dev->net_count; i++) {
 		priv = dev->nets[i];
 		if (priv) {



  parent reply	other threads:[~2021-08-02 13:52 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-02 13:44 [PATCH 4.14 00/38] 4.14.242-rc1 review Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 01/38] selftest: fix build error in tools/testing/selftests/vm/userfaultfd.c Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 02/38] KVM: x86: determine if an exception has an error code only when injecting it Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 03/38] net: split out functions related to registering inflight socket files Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 04/38] af_unix: fix garbage collect vs MSG_PEEK Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 05/38] workqueue: fix UAF in pwq_unbound_release_workfn() Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 06/38] net/802/mrp: fix memleak in mrp_request_join() Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 07/38] net/802/garp: fix memleak in garp_request_join() Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 08/38] net: annotate data race around sk_ll_usec Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 09/38] sctp: move 198 addresses from unusable to private scope Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 10/38] hfs: add missing clean-up in hfs_fill_super Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 11/38] hfs: fix high memory mapping in hfs_bnode_read Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 12/38] hfs: add lock nesting notation to hfs_find_init Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 13/38] ARM: dts: versatile: Fix up interrupt controller node names Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 14/38] virtio_net: Do not pull payload in skb->head Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 15/38] gro: ensure frag0 meets IP header alignment Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 16/38] x86/kvm: fix vcpu-id indexed array sizes Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 17/38] ocfs2: fix zero out valid data Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 18/38] ocfs2: issue zeroout to EOF blocks Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 19/38] can: raw: raw_setsockopt(): fix raw_rcv panic for sock UAF Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 20/38] can: mcba_usb_start(): add missing urb->transfer_dma initialization Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 21/38] can: usb_8dev: fix memory leak Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 22/38] can: ems_usb: " Greg Kroah-Hartman
2021-08-02 13:44 ` Greg Kroah-Hartman [this message]
2021-08-02 13:44 ` [PATCH 4.14 24/38] NIU: fix incorrect error return, missed in previous revert Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 25/38] nfc: nfcsim: fix use after free during module unload Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 26/38] x86/asm: Ensure asm/proto.h can be included stand-alone Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 27/38] cfg80211: Fix possible memory leak in function cfg80211_bss_update Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 28/38] netfilter: conntrack: adjust stop timestamp to real expiry value Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 29/38] netfilter: nft_nat: allow to specify layer 4 protocol NAT only Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 30/38] tipc: fix sleeping in tipc accept routine Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 31/38] mlx4: Fix missing error code in mlx4_load_one() Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 32/38] net: llc: fix skb_over_panic Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 33/38] net/mlx5: Fix flow table chaining Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 34/38] sctp: fix return value check in __sctp_rcv_asconf_lookup Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 35/38] tulip: windbond-840: Fix missing pci_disable_device() in probe and remove Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 36/38] sis900: " Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.14 37/38] can: hi311x: fix a signedness bug in hi3110_cmd() Greg Kroah-Hartman
2021-08-02 13:45 ` [PATCH 4.14 38/38] Revert "perf map: Fix dso->nsinfo refcounting" Greg Kroah-Hartman
2021-08-03 13:17 ` [PATCH 4.14 00/38] 4.14.242-rc1 review Naresh Kamboju
2021-08-03 19:15 ` Guenter Roeck
2021-08-04  2:56 ` Samuel Zou

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