CVE-2022-48751

In the Linux kernel, the following vulnerability has been resolved:

net/smc: Transitional solution for clcsock race issue

We encountered a crash in smc_setsockopt() and it is caused by

accessing smc->clcsock after clcsock was released.

BUG: kernel NULL pointer dereference, address: 0000000000000020

#PF: supervisor read access in kernel mode

#PF: error_code(0x0000) - not-present page

PGD 0 P4D 0

Oops: 0000 [#1] PREEMPT SMP PTI

CPU: 1 PID: 50309 Comm: nginx Kdump: loaded Tainted: G E 5.16.0-rc4+ #53

RIP: 0010:smc_setsockopt+0x59/0x280 [smc]

Call Trace:

<TASK>

__sys_setsockopt+0xfc/0x190

__x64_sys_setsockopt+0x20/0x30

do_syscall_64+0x34/0x90

entry_SYSCALL_64_after_hwframe+0x44/0xae

RIP: 0033:0x7f16ba83918e

</TASK>

This patch tries to fix it by holding clcsock_release_lock and

checking whether clcsock has already been released before access.

In case that a crash of the same reason happens in smc_getsockopt()

or smc_switch_to_fallback(), this patch also checkes smc->clcsock

in them too. And the caller of smc_switch_to_fallback() will identify

whether fallback succeeds according to the return value.