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Date:   Tue,  3 Dec 2019 11:47:00 +0100
From:   Marc Kleine-Budde <>
Cc:,,, Jouni Hogander <>,
        Wolfgang Grandegger <>,
        Marc Kleine-Budde <>,
        Oliver Hartkopp <>,
        Lukas Bulwahn <>,
        linux-stable <>
Subject: [PATCH 3/6] can: slcan: Fix use-after-free Read in slcan_open

From: Jouni Hogander <>

Slcan_open doesn't clean-up device which registration failed from the
slcan_devs device list. On next open this list is iterated and freed
device is accessed. Fix this by calling slc_free_netdev in error path.

Driver/net/can/slcan.c is derived from slip.c. Use-after-free error was
identified in slip_open by syzboz. Same bug is in slcan.c. Here is the
trace from the Syzbot slip report:

__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x197/0x210 lib/dump_stack.c:118
print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
__kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
kasan_report+0x12/0x20 mm/kasan/common.c:634
__asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
sl_sync drivers/net/slip/slip.c:725 [inline]
slip_open+0xecd/0x11b7 drivers/net/slip/slip.c:801
tty_ldisc_open.isra.0+0xa3/0x110 drivers/tty/tty_ldisc.c:469
tty_set_ldisc+0x30e/0x6b0 drivers/tty/tty_ldisc.c:596
tiocsetd drivers/tty/tty_io.c:2334 [inline]
tty_ioctl+0xe8d/0x14f0 drivers/tty/tty_io.c:2594
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:509 [inline]
do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
__do_sys_ioctl fs/ioctl.c:720 [inline]
__se_sys_ioctl fs/ioctl.c:718 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290

Fixes: ed50e1600b44 ("slcan: Fix memory leak in error path")
Cc: Wolfgang Grandegger <>
Cc: Marc Kleine-Budde <>
Cc: David Miller <>
Cc: Oliver Hartkopp <>
Cc: Lukas Bulwahn <>
Signed-off-by: Jouni Hogander <>
Cc: linux-stable <> # >= v5.4
Acked-by: Oliver Hartkopp <>
Signed-off-by: Marc Kleine-Budde <>
 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 0a9f42e5fedf..2e57122f02fb 100644
--- a/drivers/net/can/slcan.c
+++ b/drivers/net/can/slcan.c
@@ -617,6 +617,7 @@ static int slcan_open(struct tty_struct *tty)
 	sl->tty = NULL;
 	tty->disc_data = NULL;
 	clear_bit(SLF_INUSE, &sl->flags);
+	slc_free_netdev(sl->dev);

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