diff options
author | Ziyang Xuan <william.xuanziyang@huawei.com> | 2021-10-09 10:40:18 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-10-27 10:56:50 +0300 |
commit | 053bc12df0d6097c1126d0e14fa778a0a8faeb64 (patch) | |
tree | 7dee95ec90adf41b30d988c4b43094b9ff1534f7 /net/can | |
parent | 0917fb04069a51c5458a5ca95b7859de88cb61b8 (diff) | |
download | linux-053bc12df0d6097c1126d0e14fa778a0a8faeb64.tar.xz |
can: isotp: isotp_sendmsg(): add result check for wait_event_interruptible()
commit 9acf636215a6ce9362fe618e7da4913b8bfe84c8 upstream.
Using wait_event_interruptible() to wait for complete transmission,
but do not check the result of wait_event_interruptible() which can be
interrupted. It will result in TX buffer has multiple accessors and
the later process interferes with the previous process.
Following is one of the problems reported by syzbot.
=============================================================
WARNING: CPU: 0 PID: 0 at net/can/isotp.c:840 isotp_tx_timer_handler+0x2e0/0x4c0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.13.0-rc7+ #68
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014
RIP: 0010:isotp_tx_timer_handler+0x2e0/0x4c0
Call Trace:
<IRQ>
? isotp_setsockopt+0x390/0x390
__hrtimer_run_queues+0xb8/0x610
hrtimer_run_softirq+0x91/0xd0
? rcu_read_lock_sched_held+0x4d/0x80
__do_softirq+0xe8/0x553
irq_exit_rcu+0xf8/0x100
sysvec_apic_timer_interrupt+0x9e/0xc0
</IRQ>
asm_sysvec_apic_timer_interrupt+0x12/0x20
Add result check for wait_event_interruptible() in isotp_sendmsg()
to avoid multiple accessers for tx buffer.
Fixes: e057dd3fc20f ("can: add ISO 15765-2:2016 transport protocol")
Link: https://lore.kernel.org/all/10ca695732c9dd267c76a3c30f37aefe1ff7e32f.1633764159.git.william.xuanziyang@huawei.com
Cc: stable@vger.kernel.org
Reported-by: syzbot+78bab6958a614b0c80b9@syzkaller.appspotmail.com
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/can')
-rw-r--r-- | net/can/isotp.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/net/can/isotp.c b/net/can/isotp.c index c3bbbf4bb847..9492009bc4ae 100644 --- a/net/can/isotp.c +++ b/net/can/isotp.c @@ -863,7 +863,9 @@ static int isotp_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) return -EAGAIN; /* wait for complete transmission of current pdu */ - wait_event_interruptible(so->wait, so->tx.state == ISOTP_IDLE); + err = wait_event_interruptible(so->wait, so->tx.state == ISOTP_IDLE); + if (err) + return err; } if (!size || size > MAX_MSG_LENGTH) |