CVE-2023-52672

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

pipe: wakeup wrwait after setting maxusage

Commit c73be61cede5 ("pipe: Add general notification queue support") a regression was introduced that would lock up resized pipes under certain conditions. See the reproducer in [1].

The commit resizing the pipe ring size was moved to a different function, doing that moved the wakeup for pipe->wrwait before actually raising pipe->maxusage. If a pipe was full before the resize occured it would result in the wakeup never actually triggering pipe_write.

Set @maxusage and @nraccounted before waking writers if this isn't a watch queue.

[Christian Brauner brauner@kernel.org: rewrite to account for watch queues]