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Date: Mon, 20 Sep 2021 18:42:55 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Valentina Palmiotti <vpalmiotti@...il.com>, Pavel Begunkov <asml.silence@...il.com>, Jens Axboe <axboe@...nel.dk> Subject: [PATCH 5.10 003/122] io_uring: ensure symmetry in handling iter types in loop_rw_iter() From: Jens Axboe <axboe@...nel.dk> commit 16c8d2df7ec0eed31b7d3b61cb13206a7fb930cc 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: 4017eb91a9e7 ("io_uring: make loop_rw_iter() use original user supplied pointers") Cc: stable@...r.kernel.org Reported-by: Valentina Palmiotti <vpalmiotti@...il.com> Reviewed-by: Pavel Begunkov <asml.silence@...il.com> Signed-off-by: Jens Axboe <axboe@...nel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- fs/io_uring.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -3206,12 +3206,15 @@ static ssize_t loop_rw_iter(int rw, stru 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;
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