CVE-2021-47457

In the Linux kernel, the following vulnerability has been resolved: can:
isotp: isotp_sendmsg(): add result check for wait_event_interruptible()
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.