Subject: FAILED: patch "[PATCH] dm raid: fix address sanitizer warning in raid_resume" failed to apply to 4.9-stable tree
To:     mpatocka@redhat.com, snitzer@kernel.org
Cc:     <stable@vger.kernel.org>
From:   <gregkh@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 13:43:09 +0200
Message-ID: <16605637897249@kroah.com>
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The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 7dad24db59d2d2803576f2e3645728866a056dab Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka@redhat.com>
Date: Sun, 24 Jul 2022 14:33:52 -0400
Subject: [PATCH] dm raid: fix address sanitizer warning in raid_resume

There is a KASAN warning in raid_resume when running the lvm test
lvconvert-raid.sh. The reason for the warning is that mddev->raid_disks
is greater than rs->raid_disks, so the loop touches one entry beyond
the allocated length.

Cc: stable@vger.kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index f41fd3cf5c7d..e6a9b8cb22d3 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -3817,7 +3817,7 @@ static void attempt_restore_of_faulty_devices(struct raid_set *rs)
 
 	memset(cleared_failed_devices, 0, sizeof(cleared_failed_devices));
 
-	for (i = 0; i < mddev->raid_disks; i++) {
+	for (i = 0; i < rs->raid_disks; i++) {
 		r = &rs->dev[i].rdev;
 		/* HM FIXME: enhance journal device recovery processing */
 		if (test_bit(Journal, &r->flags))