io_uring/rw: ensure io->bytes_done is always initialized

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commit 0a535eddbe upstream.

If IOSQE_ASYNC is set and we fail importing an iovec for a readv or
writev request, then we leave ->bytes_done uninitialized and hence the
eventual failure CQE posted can potentially have a random res value
rather than the expected -EINVAL.

Setup ->bytes_done before potentially failing, so we have a consistent
value if we fail the request early.

Cc: stable@vger.kernel.org
Reported-by: xingwei lee <xrivendell7@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 2023-12-21 08:49:18 -07:00 • committed by Greg Kroah-Hartman

parent d413a34227

commit ba8d8a8a36

1 changed files with 7 additions and 3 deletions

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io_uring/rw.c

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