Patch "Fix match_prepath()" has been added to the 4.9-stable tree

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

Fix match_prepath()

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:
fix-match_prepath.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 <[email protected]> know about it.

From: Sachin Prabhu <[email protected]>
Date: Wed, 26 Apr 2017 14:05:46 +0100
Subject: Fix match_prepath()

From: Sachin Prabhu <[email protected]>

commit cd8c42968ee651b69e00f8661caff32b0086e82d upstream.

Incorrect return value for shares not using the prefix path means that we will never match superblocks for these shares.

---
 fs/cifs/connect.c |   14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

@@ -2839,16 +2839,14 @@ match_prepath(struct super_block *sb, st
 {
 	struct cifs_sb_info *old = CIFS_SB(sb);
 	struct cifs_sb_info *new = mnt_data->cifs_sb;
+	bool old_set = old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH;
+	bool new_set = new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH;
 
-	if (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) {
-		if (!(new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH))
-			return 0;
-		/* The prepath should be null terminated strings */
-		if (strcmp(new->prepath, old->prepath))
-			return 0;
-
+	if (old_set && new_set && !strcmp(new->prepath, old->prepath))
+		return 1;
+	else if (!old_set && !new_set)
 		return 1;
-	}
+
 	return 0;
 }
 

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

queue-4.9/fix-match_prepath.patch