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Date: Fri, 22 Nov 2019 14:49:55 -0500 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Jouni Hogander <jouni.hogander@...kie.com>, Wolfgang Grandegger <wg@...ndegger.com>, Marc Kleine-Budde <mkl@...gutronix.de>, Lukas Bulwahn <lukas.bulwahn@...il.com>, Sasha Levin <sashal@...nel.org>, linux-can@...r.kernel.org, netdev@...r.kernel.org Subject: [PATCH AUTOSEL 4.9 10/13] slcan: Fix memory leak in error path From: Jouni Hogander <jouni.hogander@...kie.com> [ Upstream commit ed50e1600b4483c049ce76e6bd3b665a6a9300ed ] This patch is fixing memory leak reported by Syzkaller: BUG: memory leak unreferenced object 0xffff888067f65500 (size 4096): comm "syz-executor043", pid 454, jiffies 4294759719 (age 11.930s) hex dump (first 32 bytes): 73 6c 63 61 6e 30 00 00 00 00 00 00 00 00 00 00 slcan0.......... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000a06eec0d>] __kmalloc+0x18b/0x2c0 [<0000000083306e66>] kvmalloc_node+0x3a/0xc0 [<000000006ac27f87>] alloc_netdev_mqs+0x17a/0x1080 [<0000000061a996c9>] slcan_open+0x3ae/0x9a0 [<000000001226f0f9>] tty_ldisc_open.isra.1+0x76/0xc0 [<0000000019289631>] tty_set_ldisc+0x28c/0x5f0 [<000000004de5a617>] tty_ioctl+0x48d/0x1590 [<00000000daef496f>] do_vfs_ioctl+0x1c7/0x1510 [<0000000059068dbc>] ksys_ioctl+0x99/0xb0 [<000000009a6eb334>] __x64_sys_ioctl+0x78/0xb0 [<0000000053d0332e>] do_syscall_64+0x16f/0x580 [<0000000021b83b99>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [<000000008ea75434>] 0xffffffffffffffff Cc: Wolfgang Grandegger <wg@...ndegger.com> Cc: Marc Kleine-Budde <mkl@...gutronix.de> Cc: Lukas Bulwahn <lukas.bulwahn@...il.com> Signed-off-by: Jouni Hogander <jouni.hogander@...kie.com> Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de> Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/net/can/slcan.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/can/slcan.c b/drivers/net/can/slcan.c index eb7173713bbcb..a2c4048c07bec 100644 --- a/drivers/net/can/slcan.c +++ b/drivers/net/can/slcan.c @@ -613,6 +613,7 @@ static int slcan_open(struct tty_struct *tty) sl->tty = NULL; tty->disc_data = NULL; clear_bit(SLF_INUSE, &sl->flags); + free_netdev(sl->dev); err_exit: rtnl_unlock(); -- 2.20.1
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