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io_uring: ensure symmetry in handling iter types in loop_rw_iter()

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commit 16c8d2df7e upstream.

When setting up the next segment, we check what type the iter is and
handle it accordingly. However, when incrementing and processed amount
we do not, and both iter advance and addr/len are adjusted, regardless
of type. Split the increment side just like we do on the setup side.

Fixes: 4017eb91a9 ("io_uring: make loop_rw_iter() use original user supplied pointers")
Cc: stable@vger.kernel.org
Reported-by: Valentina Palmiotti <vpalmiotti@gmail.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jens Axboe 2021-09-12 06:45:07 -06:00 • committed by Greg Kroah-Hartman
parent 1e93a76c69
commit 71e32edd22
1 changed files with 6 additions and 3 deletions
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9
fs/io_uring.c
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@ -3107,12 +3107,15 @@ static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter)
ret = nr;
break;
}
if (!iov_iter_is_bvec(iter)) {
iov_iter_advance(iter, nr);
} else {
req->rw.len -= nr;
req->rw.addr += nr;
}
ret += nr;
if (nr != iovec.iov_len)
break;
req->rw.len -= nr;
req->rw.addr += nr;
iov_iter_advance(iter, nr);
}
return ret;