Patch "badblocks: fix wrong return value in badblocks_set if badblocks are disabled" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    badblocks: fix wrong return value in badblocks_set if badblocks are disabled

to the 4.9-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:
     badblocks-fix-wrong-return-value-in-badblocks_set-if-badblocks-are-disabled.patch
and it can be found in the queue-4.9 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 foo@baz Mon Dec 18 14:12:35 CET 2017
From: Liu Bo <bo.li.liu@oracle.com>
Date: Fri, 3 Nov 2017 11:24:44 -0600
Subject: badblocks: fix wrong return value in badblocks_set if badblocks are disabled

From: Liu Bo <bo.li.liu@oracle.com>


[ Upstream commit 39b4954c0a1556f8f7f1fdcf59a227117fcd8a0b ]

MD's rdev_set_badblocks() expects that badblocks_set() returns 1 if
badblocks are disabled, otherwise, rdev_set_badblocks() will record
superblock changes and return success in that case and md will fail to
report an IO error which it should.

This bug has existed since badblocks were introduced in commit
9e0e252a048b ("badblocks: Add core badblock management code").

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Acked-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 block/badblocks.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/block/badblocks.c
+++ b/block/badblocks.c
@@ -178,7 +178,7 @@ int badblocks_set(struct badblocks *bb,
 
 	if (bb->shift < 0)
 		/* badblocks are disabled */
-		return 0;
+		return 1;
 
 	if (bb->shift) {
 		/* round the start down, and the end up */


Patches currently in stable-queue which might be from bo.li.liu@oracle.com are

queue-4.9/badblocks-fix-wrong-return-value-in-badblocks_set-if-badblocks-are-disabled.patch
queue-4.9/btrfs-add-missing-memset-while-reading-compressed-inline-extents.patch