Patch "dm raid: fix compat_features validation" has been added to the 4.8-stable tree

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

dm raid: fix compat_features validation

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:
dm-raid-fix-compat_features-validation.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 <[email protected]> know about it.

From: Andy Whitcroft <[email protected]>
Date: Tue, 11 Oct 2016 15:16:57 +0100
Subject: dm raid: fix compat_features validation

From: Andy Whitcroft <[email protected]>

commit 5c33677c87cbe44ae04df69c4a29c1750a9ec4e5 upstream.

In ecbfb9f118bce4 ("dm raid: add raid level takeover support") a new compatible feature flag was added. Validation for these compat_features was added but this only passes for new raid mappings with this feature flag. This causes previously created raid mappings to be failed at import.

Check compat_features for the only valid combination.

---
 drivers/md/dm-raid.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

@@ -2258,7 +2258,8 @@ static int super_validate(struct raid_se
 	if (!mddev->events && super_init_validation(rs, rdev))
 		return -EINVAL;
 
-	if (le32_to_cpu(sb->compat_features) != FEATURE_FLAG_SUPPORTS_V190) {
+	if (le32_to_cpu(sb->compat_features) &&
+	    le32_to_cpu(sb->compat_features) != FEATURE_FLAG_SUPPORTS_V190) {
 		rs->ti->error = "Unable to assemble array: Unknown flag(s) in compatible feature flags";
 		return -EINVAL;
 	}

Patches currently in stable-queue which might be from [email protected] are

queue-4.8/dm-raid-fix-compat_features-validation.patch