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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Juliana Rodrigueiro <juliana.rodrigueiro@intra2net.com>,
	"David S . Miller" <davem@davemloft.net>,
	Sasha Levin <sashal@kernel.org>,
	netdev@vger.kernel.org
Subject: [PATCH AUTOSEL 5.2 069/123] isdn: hfcsusb: Fix mISDN driver crash caused by transfer buffer on the stack
Date: Tue, 13 Aug 2019 22:09:53 -0400
Message-ID: <20190814021047.14828-69-sashal@kernel.org> (raw)
In-Reply-To: <20190814021047.14828-1-sashal@kernel.org>

From: Juliana Rodrigueiro <juliana.rodrigueiro@intra2net.com>

[ Upstream commit d8a1de3d5bb881507602bc02e004904828f88711 ]

Since linux 4.9 it is not possible to use buffers on the stack for DMA transfers.

During usb probe the driver crashes with "transfer buffer is on stack" message.

This fix k-allocates a buffer to be used on "read_reg_atomic", which is a macro
that calls "usb_control_msg" under the hood.

Kernel 4.19 backtrace:

usb_hcd_submit_urb+0x3e5/0x900
? sched_clock+0x9/0x10
? log_store+0x203/0x270
? get_random_u32+0x6f/0x90
? cache_alloc_refill+0x784/0x8a0
usb_submit_urb+0x3b4/0x550
usb_start_wait_urb+0x4e/0xd0
usb_control_msg+0xb8/0x120
hfcsusb_probe+0x6bc/0xb40 [hfcsusb]
usb_probe_interface+0xc2/0x260
really_probe+0x176/0x280
driver_probe_device+0x49/0x130
__driver_attach+0xa9/0xb0
? driver_probe_device+0x130/0x130
bus_for_each_dev+0x5a/0x90
driver_attach+0x14/0x20
? driver_probe_device+0x130/0x130
bus_add_driver+0x157/0x1e0
driver_register+0x51/0xe0
usb_register_driver+0x5d/0x120
? 0xf81ed000
hfcsusb_drv_init+0x17/0x1000 [hfcsusb]
do_one_initcall+0x44/0x190
? free_unref_page_commit+0x6a/0xd0
do_init_module+0x46/0x1c0
load_module+0x1dc1/0x2400
sys_init_module+0xed/0x120
do_fast_syscall_32+0x7a/0x200
entry_SYSENTER_32+0x6b/0xbe

Signed-off-by: Juliana Rodrigueiro <juliana.rodrigueiro@intra2net.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/isdn/hardware/mISDN/hfcsusb.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/isdn/hardware/mISDN/hfcsusb.c b/drivers/isdn/hardware/mISDN/hfcsusb.c
index 8fb7c5dea07fc..008a74a1ed444 100644
--- a/drivers/isdn/hardware/mISDN/hfcsusb.c
+++ b/drivers/isdn/hardware/mISDN/hfcsusb.c
@@ -1693,13 +1693,23 @@ hfcsusb_stop_endpoint(struct hfcsusb *hw, int channel)
 static int
 setup_hfcsusb(struct hfcsusb *hw)
 {
+	void *dmabuf = kmalloc(sizeof(u_char), GFP_KERNEL);
 	u_char b;
+	int ret;
 
 	if (debug & DBG_HFC_CALL_TRACE)
 		printk(KERN_DEBUG "%s: %s\n", hw->name, __func__);
 
+	if (!dmabuf)
+		return -ENOMEM;
+
+	ret = read_reg_atomic(hw, HFCUSB_CHIP_ID, dmabuf);
+
+	memcpy(&b, dmabuf, sizeof(u_char));
+	kfree(dmabuf);
+
 	/* check the chip id */
-	if (read_reg_atomic(hw, HFCUSB_CHIP_ID, &b) != 1) {
+	if (ret != 1) {
 		printk(KERN_DEBUG "%s: %s: cannot read chip id\n",
 		       hw->name, __func__);
 		return 1;
-- 
2.20.1


  parent reply index

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20190814021047.14828-1-sashal@kernel.org>
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 020/123] libbpf: sanitize VAR to conservative 1-byte INT Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 021/123] netfilter: ebtables: fix a memory leak bug in compat Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 025/123] bpf: sockmap, sock_map_delete needs to use xchg Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 026/123] bpf: sockmap, synchronize_rcu before free'ing map Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 027/123] bpf: sockmap, only create entry if ulp is not already enabled Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 028/123] selftests/bpf: fix sendmsg6_prog on s390 Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 030/123] bonding: Force slave speed check after link state recovery for 802.3ad Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 031/123] net: mvpp2: Don't check for 3 consecutive Idle frames for 10G links Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 032/123] selftests: forwarding: gre_multipath: Enable IPv4 forwarding Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 033/123] selftests: forwarding: gre_multipath: Fix flower filters Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 034/123] bpf: fix access to skb_shared_info->gso_segs Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 035/123] selftests/bpf: add another gso_segs access Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 036/123] libbpf: fix using uninitialized ioctl results Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 037/123] can: dev: call netif_carrier_off() in register_candev() Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 038/123] can: mcp251x: add error check when wq alloc failed Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 039/123] can: gw: Fix error path of cgw_module_init Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 042/123] libbpf: silence GCC8 warning about string truncation Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 043/123] st21nfca_connectivity_event_received: null check the allocation Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 044/123] st_nci_hci_connectivity_event_received: " Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 045/123] {nl,mac}80211: fix interface combinations on crypto controlled devices Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 049/123] net: usb: qmi_wwan: Add the BroadMobi BM818 card Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 050/123] qed: RDMA - Fix the hw_ver returned in device attributes Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 051/123] isdn: mISDN: hfcsusb: Fix possible null-pointer dereferences in start_isoc_chain() Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 053/123] mac80211_hwsim: Fix possible null-pointer dereferences in hwsim_dump_radio_nl() Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 054/123] net: stmmac: manage errors returned by of_get_mac_address() Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 055/123] netfilter: ipset: Actually allow destination MAC address for hash:ip,mac sets too Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 056/123] netfilter: ipset: Copy the right MAC address in bitmap:ip,mac and hash:ip,mac sets Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 057/123] netfilter: ipset: Fix rename concurrency with listing Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 058/123] netfilter: ebtables: also count base chain policies Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 059/123] rxrpc: Fix potential deadlock Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 060/123] rxrpc: Fix the lack of notification when sendmsg() fails on a DATA packet Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 062/123] iwlwifi: mvm: avoid races in rate init and rate perform Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 063/123] iwlwifi: dbg_ini: move iwl_dbg_tlv_load_bin out of debug override ifdef Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 064/123] iwlwifi: dbg_ini: move iwl_dbg_tlv_free outside of debugfs ifdef Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 065/123] iwlwifi: fix locking in delayed GTK setting Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 066/123] iwlwifi: mvm: send LQ command always ASYNC Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 068/123] enetc: Fix build error without PHYLIB Sasha Levin
2019-08-14  2:09 ` Sasha Levin [this message]
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 070/123] net: phy: phy_led_triggers: Fix a possible null-pointer dereference in phy_led_trigger_change_speed() Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 073/123] net: usb: pegasus: fix improper read if get_registers() fail Sasha Levin
2019-08-14  2:09 ` [PATCH AUTOSEL 5.2 075/123] can: sja1000: force the string buffer NULL-terminated Sasha Levin
2019-08-14  2:10 ` [PATCH AUTOSEL 5.2 076/123] can: peak_usb: " Sasha Levin
2019-08-14  2:10 ` [PATCH AUTOSEL 5.2 078/123] net/ethernet/qlogic/qed: " Sasha Levin
2019-08-14  2:10 ` [PATCH AUTOSEL 5.2 079/123] enetc: Select PHYLIB while CONFIG_FSL_ENETC_VF is set Sasha Levin
2019-08-14  2:10 ` [PATCH AUTOSEL 5.2 102/123] net: cxgb3_main: Fix a resource leak in a error path in 'init_one()' Sasha Levin
2019-08-14  2:10 ` [PATCH AUTOSEL 5.2 103/123] net: stmmac: Fix issues when number of Queues >= 4 Sasha Levin
2019-08-14  2:10 ` [PATCH AUTOSEL 5.2 104/123] net: stmmac: tc: Do not return a fragment entry Sasha Levin
2019-08-14  2:10 ` [PATCH AUTOSEL 5.2 106/123] net: hisilicon: make hip04_tx_reclaim non-reentrant Sasha Levin
2019-08-14  2:10 ` [PATCH AUTOSEL 5.2 107/123] net: hisilicon: fix hip04-xmit never return TX_BUSY Sasha Levin
2019-08-14  2:10 ` [PATCH AUTOSEL 5.2 108/123] net: hisilicon: Fix dma_map_single failed on arm64 Sasha Levin

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