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bio_copy_user_iov(): don't ignore ->iov_offset 

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...

Cc: stable@vger.kernel.org #v4.5+
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-09-24 10:21:15 -04:00
parent 2b04e8f6bb
commit 1cfd0ddd82
1 changed files with 2 additions and 2 deletions
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4
block/bio.c
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@ -1239,8 +1239,8 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
*/ */
bmd->is_our_pages = map_data ? 0 : 1; bmd->is_our_pages = map_data ? 0 : 1;
memcpy(bmd->iov, iter->iov, sizeof(struct iovec) * iter->nr_segs); memcpy(bmd->iov, iter->iov, sizeof(struct iovec) * iter->nr_segs);
iov_iter_init(&bmd->iter, iter->type, bmd->iov, bmd->iter = *iter;
iter->nr_segs, iter->count); bmd->iter.iov = bmd->iov;
ret = -ENOMEM; ret = -ENOMEM;
bio = bio_kmalloc(gfp_mask, nr_pages); bio = bio_kmalloc(gfp_mask, nr_pages);