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io_uring/kbuf: hold io_buffer_list reference over mmap
commit 561e4f9 upstream. If we look up the kbuf, ensure that it doesn't get unregistered until after we're done with it. Since we're inside mmap, we cannot safely use the io_uring lock. Rely on the fact that we can lookup the buffer list under RCU now and grab a reference to it, preventing it from being unregistered until we're done with it. The lookup returns the io_buffer_list directly with it referenced. Cc: stable@vger.kernel.org # v6.4+ Fixes: 5cf4f52 ("io_uring: free io_buffer_list entries via RCU") Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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