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

io_uring/poll: fix signed comparison in io_poll_get_ownership()

io_poll_get_ownership() uses a signed comparison to check whether
poll_refs has reached the threshold for the slowpath:

    if (unlikely(atomic_read(&req->poll_refs) >= IO_POLL_REF_BIAS))

atomic_read() returns int (signed). When IO_POLL_CANCEL_FLAG
(BIT(31)) is set in poll_refs, the value becomes negative in
signed arithmetic, so the >= 128 comparison always evaluates to
false and the slowpath is never taken.

Fix this by casting the atomic_read() result to unsigned int
before the comparison, so that the cancel flag is treated as a
large positive value and correctly triggers the slowpath.

https://git.kernel.org/stable/c/326941b22806cbf2df1fbfe902b7908b368cce42

https://git.kernel.org/stable/c/81bf96b0abbfa4cd47ea32e12596aed3855fb2f3

https://git.kernel.org/stable/c/c6d191164dc81838d8dbf452a6000f68c558d1ae

https://git.kernel.org/stable/c/cf522703d4f194991615763697ae25a3f9539763

https://git.kernel.org/stable/c/ea0697129807d718037f618221037aa0660ee3c5

https://git.kernel.org/stable/c/fc47043f3d9af3efa407665b47f8378ec691ba18

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