Patch "dm raid: fix missing reconfig_mutex unlock in raid_ctr() error paths" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

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

    dm raid: fix missing reconfig_mutex unlock in raid_ctr() error paths

to the 5.15-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:
     dm-raid-fix-missing-reconfig_mutex-unlock-in-raid_ct.patch
and it can be found in the queue-5.15 subdirectory.

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



commit c5b0e9bc5363c25703c2f2ce42bd2190e6cd6a3b
Author: Yu Kuai <yukuai3@xxxxxxxxxx>
Date:   Sat Jul 8 17:21:51 2023 +0800

    dm raid: fix missing reconfig_mutex unlock in raid_ctr() error paths
    
    [ Upstream commit bae3028799dc4f1109acc4df37c8ff06f2d8f1a0 ]
    
    In the error paths 'bad_stripe_cache' and 'bad_check_reshape',
    'reconfig_mutex' is still held after raid_ctr() returns.
    
    Fixes: 9dbd1aa3a81c ("dm raid: add reshaping support to the target")
    Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
    Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index eba277bb8a1f1..d3ac3b894bdf5 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -3278,15 +3278,19 @@ static int raid_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 	/* Try to adjust the raid4/5/6 stripe cache size to the stripe size */
 	if (rs_is_raid456(rs)) {
 		r = rs_set_raid456_stripe_cache(rs);
-		if (r)
+		if (r) {
+			mddev_unlock(&rs->md);
 			goto bad_stripe_cache;
+		}
 	}
 
 	/* Now do an early reshape check */
 	if (test_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) {
 		r = rs_check_reshape(rs);
-		if (r)
+		if (r) {
+			mddev_unlock(&rs->md);
 			goto bad_check_reshape;
+		}
 
 		/* Restore new, ctr requested layout to perform check */
 		rs_config_restore(rs, &rs_layout);
@@ -3295,6 +3299,7 @@ static int raid_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 			r = rs->md.pers->check_reshape(&rs->md);
 			if (r) {
 				ti->error = "Reshape check failed";
+				mddev_unlock(&rs->md);
 				goto bad_check_reshape;
 			}
 		}