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Subject[PATCH 4.8 38/45] Dont feed anything but regular iovecs to blk_rq_map_user_iov
Date
4.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Linus Torvalds <torvalds@linux-foundation.org>

commit a0ac402cfcdc904f9772e1762b3fda112dcc56a0 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
block/blk-map.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -118,6 +118,9 @@ int blk_rq_map_user_iov(struct request_q
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_q

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

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