This is a note to let you know that I've just added the patch titled
Don't feed anything but regular iovec's to blk_rq_map_user_iov
to the 4.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
don-t-feed-anything-but-regular-iovec-s-to-blk_rq_map_user_iov.patch
and it can be found in the queue-4.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a0ac402cfcdc904f9772e1762b3fda112dcc56a0 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Tue, 6 Dec 2016 16:18:14 -0800
Subject: Don't feed anything but regular iovec's to blk_rq_map_user_iov
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
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@xxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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;
}
Patches currently in stable-queue which might be from torvalds@xxxxxxxxxxxxxxxxxxxx are
queue-4.8/don-t-feed-anything-but-regular-iovec-s-to-blk_rq_map_user_iov.patch
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