Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.13 39/53] bio_copy_user_iov(): dont ignore ->iov_offset | Date | Mon, 16 Oct 2017 18:16:36 +0200 |
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4.13-stable review patch. If anyone has any objections, please let me know.
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From: Al Viro <viro@zeniv.linux.org.uk>
commit 1cfd0ddd82232804e03f3023f6a58b50dfef0574 upstream.
Since "block: support large requests in blk_rq_map_user_iov" we started to call it with partially drained iter; that works fine on the write side, but reads create a copy of iter for completion time. And that needs to take the possibility of ->iov_iter != 0 into account...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- block/bio.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/block/bio.c +++ b/block/bio.c @@ -1235,8 +1235,8 @@ struct bio *bio_copy_user_iov(struct req */ bmd->is_our_pages = map_data ? 0 : 1; memcpy(bmd->iov, iter->iov, sizeof(struct iovec) * iter->nr_segs); - iov_iter_init(&bmd->iter, iter->type, bmd->iov, - iter->nr_segs, iter->count); + bmd->iter = *iter; + bmd->iter.iov = bmd->iov; ret = -ENOMEM; bio = bio_kmalloc(gfp_mask, nr_pages);
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