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Change History

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

net: netpoll: initialize work queue before error checks

Prevent a kernel warning when netconsole setup fails on devices with
IFF_DISABLE_NETPOLL flag. The warning (at kernel/workqueue.c:4242 in
__flush_work) occurs because the cleanup path tries to cancel an
uninitialized work queue.

When __netpoll_setup() encounters a device with IFF_DISABLE_NETPOLL,
it fails early and calls skb_pool_flush() for cleanup. This function
calls cancel_work_sync(&np->refill_wq), but refill_wq hasn't been
initialized yet, triggering the warning.

Move INIT_WORK() to the beginning of __netpoll_setup(), ensuring the
work queue is properly initialized before any potential failure points.
This allows the cleanup path to safely cancel the work queue regardless
of where the setup fails.

https://git.kernel.org/stable/c/760bc6ceda8e2c273c0e2018ad2595967c3dd308

https://git.kernel.org/stable/c/a90d0dc38a10347078cca60e7495ad0648838f18

https://git.kernel.org/stable/c/e5235eb6cfe02a51256013a78f7b28779a7740d5