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linux-can-fixes-for-5.18-20220417

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Merge tag 'linux-can-fixes-for-5.18-20220417' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can

Marc Kleine-Budde says:

====================
pull-request: can 2022-04-17

this is a pull request of 1 patch for net/master.

The patch is by Oliver Hartkopp and fixes a timeout monitoring problem
in the ISO TP protocol found by the syzbot.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2022-04-18 10:22:22 +01:00
commit d94ef51d5b
1 changed files with 9 additions and 1 deletions
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10
net/can/isotp.c
View File

@ -906,6 +906,7 @@ static int isotp_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
struct canfd_frame *cf;
int ae = (so->opt.flags & CAN_ISOTP_EXTEND_ADDR) ? 1 : 0;
int wait_tx_done = (so->opt.flags & CAN_ISOTP_WAIT_TX_DONE) ? 1 : 0;
s64 hrtimer_sec = 0;
int off;
int err;
@ -1004,7 +1005,9 @@ static int isotp_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
isotp_create_fframe(cf, so, ae);
/* start timeout for FC */
hrtimer_start(&so->txtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT);
hrtimer_sec = 1;
hrtimer_start(&so->txtimer, ktime_set(hrtimer_sec, 0),
HRTIMER_MODE_REL_SOFT);
}
/* send the first or only CAN frame */
@ -1017,6 +1020,11 @@ static int isotp_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
if (err) {
pr_notice_once("can-isotp: %s: can_send_ret %pe\n",
__func__, ERR_PTR(err));
/* no transmission -> no timeout monitoring */
if (hrtimer_sec)
hrtimer_cancel(&so->txtimer);
goto err_out_drop;
}