Patch "Don't feed anything but regular iovec's to blk_rq_map_user_iov" has been added to the 4.4-stable tree

Patch "Don't feed anything but regular iovec's to blk_rq_map_user_iov" has been added to the 4.4-stable tree

[gregkh]

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 4.4-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-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From a0ac402cfcdc904f9772e1762b3fda112dcc56a0 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@linux-foundation.org>
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@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 |    3 +++
 1 file changed, 3 insertions(+)

--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -90,6 +90,9 @@ int blk_rq_map_user_iov(struct request_q
 	if (!iter || !iter->count)
 		return -EINVAL;
 
+	if (!iter_is_iovec((struct iov_iter *)iter))
+		return -EINVAL;
+
 	iov_for_each(iov, i, *iter) {
 		unsigned long uaddr = (unsigned long) iov.iov_base;
 


Patches currently in stable-queue which might be from torvalds@linux-foundation.org are

queue-4.4/don-t-feed-anything-but-regular-iovec-s-to-blk_rq_map_user_iov.patch