1 files changed, 9 insertions, 2 deletions

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 12e38c213b70..a95e5d1f4a9c 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -3262,10 +3262,17 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass,
         if (depth) {
                 hlock = curr->held_locks + depth - 1;
                 if (hlock->class_idx == class_idx && nest_lock) {
-                        if (hlock->references)
+                        if (hlock->references) {
+                                /*
+                                 * Check: unsigned int references:12, overflow.
+                                 */
+                                if (DEBUG_LOCKS_WARN_ON(hlock->references == (1 << 12)-1))
+                                        return 0;
+
                                 hlock->references++;
-                        else
+                        } else {
                                 hlock->references = 2;
+                        }
 
                         return 1;
                 }