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16 September 2024, 20:19:31 UTC
Revision 3851d25c75ed03117268a8feb34adca5a843a126 authored by Jens Axboe on 10 November 2022, 17:50:55 UTC, committed by Jens Axboe on 10 November 2022, 18:07:41 UTC 
io_uring: check for rollover of buffer ID when providing buffers
 
We already check if the chosen starting offset for the buffer IDs fit
within an unsigned short, as 65535 is the maximum value for a provided
buffer. But if the caller asks to add N buffers at offset M, and M + N
would exceed the size of the unsigned short, we simply add buffers with
wrapping around the ID.

This is not necessarily a bug and could in fact be a valid use case, but
it seems confusing and inconsistent with the initial check for starting
offset. Let's check for wrap consistently, and error the addition if we
do need to wrap.

Reported-by: Olivier Langlois <olivier@trillion01.com>
Link: https://github.com/axboe/liburing/issues/726
Cc: stable@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 parent 0fc8c2a
History
Tip revision: 3851d25c75ed03117268a8feb34adca5a843a126 authored by Jens Axboe on 10 November 2022, 17:50:55 UTC
io_uring: check for rollover of buffer ID when providing buffers
Tip revision: 3851d25
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