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io_uring/rw: always clear ->bytes_done on io_async_rw setup

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A previous commit mistakenly moved the clearing of the in-progress byte
count into the section that's dependent on having a cached iovec or not,
but it should be cleared for any IO. If not, then extra bytes may be
added at IO completion time, causing potentially weird behavior like
over-reporting the amount of IO done.

Fixes: d7f11616ed ("io_uring/rw: Allocate async data through helper")
Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202412271132.a09c3500-lkp@intel.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2024-12-27 09:49:32 -07:00
parent 21adbcaa80
commit c5f7191614
1 changed files with 1 additions and 1 deletions
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2
io_uring/rw.c
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@ -228,8 +228,8 @@ static int io_rw_alloc_async(struct io_kiocb *req)
kasan_mempool_unpoison_object(rw->free_iovec,
rw->free_iov_nr * sizeof(struct iovec));
req->flags |= REQ_F_NEED_CLEANUP;
rw->bytes_done = 0;
}
rw->bytes_done = 0;
return 0;
}