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Change History

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

io_uring: fix memory leak when removing provided buffers

When removing provided buffers, io_buffer structs are not being disposed
of, leading to a memory leak. They can't be freed individually, because
they are allocated in page-sized groups. They need to be added to some
free list instead, such as io_buffers_cache. All callers already hold
the lock protecting it, apart from when destroying buffers, so had to
extend the lock there.

https://git.kernel.org/stable/c/ac48787f58d1068f4e06d627c1135784d64b4c72

https://git.kernel.org/stable/c/b4a72c0589fdea6259720375426179888969d6a2

https://git.kernel.org/stable/c/c117c15927772d1624c29c092b6bd3f47c7faa48