io_uring/kbuf: check if target buffer list is still legacy on recycle

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commit c2c185be5c upstream.

There's a gap between when the buffer was grabbed and when it
potentially gets recycled, where if the list is empty, someone could've
upgraded it to a ring provided type. This can happen if the request
is forced via io-wq. The legacy recycling is missing checking if the
buffer_list still exists, and if it's of the correct type. Add those
checks.

Cc: stable@vger.kernel.org
Fixes: c7fb19428d ("io_uring: add support for ring mapped supplied buffers")
Reported-by: Keenan Dong <keenanat2000@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Jens Axboe 2026-03-12 08:59:25 -06:00 • committed by Greg Kroah-Hartman

parent 950bda065b

commit 50ad880db3

1 changed files with 11 additions and 2 deletions

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io_uring/kbuf.c

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