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Date:   Wed, 6 Dec 2017 23:13:53 +0100
From:   Ingo Molnar <>
To:     Linus Torvalds <>
        Peter Zijlstra <>,
        Thomas Gleixner <>,
        Andrew Morton <>
Subject: [GIT PULL] lockdep fix


Please pull the latest locking-urgent-for-linus git tree from:

   git:// locking-urgent-for-linus

   # HEAD: 5e351ad106997e06b2dc3da9c6b939b95f67fb88 locking/lockdep: Fix possible NULL deref

Fix a possible NULL dereference for the (rare) case when a task doesn't have 
->xhlocks space allocated due to kmalloc() OOM-ing.



Peter Zijlstra (1):
      locking/lockdep: Fix possible NULL deref

 kernel/locking/lockdep.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 9776da8db180..670d8d7d8087 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -4790,7 +4790,8 @@ void lockdep_invariant_state(bool force)
 	 * Verify the former, enforce the latter.
 	WARN_ON_ONCE(!force && current->lockdep_depth);
-	invalidate_xhlock(&xhlock(current->xhlock_idx));
+	if (current->xhlocks)
+		invalidate_xhlock(&xhlock(current->xhlock_idx));
 static int cross_lock(struct lockdep_map *lock)

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