Commit a0ac402c authored Dec 06, 2016 by Linus Torvalds

Don't feed anything but regular iovec's to blk_rq_map_user_iov



In theory we could map other things, but there's a reason that function
is called "user_iov".  Using anything else (like splice can do) just
confuses it.

Reported-and-tested-by: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent bc3913a5

block/blk-map.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -118,6 +118,9 @@ int blk_rq_map_user_iov(struct request_queue q, struct request rq,
		struct iov_iter i;
		int ret;

		if (!iter_is_iovec(iter))
		goto fail;

		if (map_data)
		copy = true;
		else if (iov_iter_alignment(iter) & align)
		@@ -140,6 +143,7 @@ int blk_rq_map_user_iov(struct request_queue q, struct request rq,

		unmap_rq:
		__blk_rq_unmap_user(bio);
		fail:
		rq->bio = NULL;
		return -EINVAL;
		}