Fix match_prepath()

commit cd8c42968ee651b69e00f8661caff32b0086e82d upstream.

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

Fixes: commit c1d8b24d1819 ("Compare prepaths when comparing superblocks")
Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 6 insertions, 8 deletions

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index b8015de88e8c..1a545695f547 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -2839,16 +2839,14 @@ match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
 {
         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;
 }