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authorPeter Zijlstra <peterz@infradead.org>2017-12-06 17:32:47 +0100
committerIngo Molnar <mingo@kernel.org>2017-12-06 19:29:56 +0100
commit5e351ad106997e06b2dc3da9c6b939b95f67fb88 (patch)
treec3f2ca916c260a9abc2b92a2d528ab093a4a4878 /kernel/locking
parent328b4ed93b69a6f2083d52f31a240a09e5de386a (diff)
locking/lockdep: Fix possible NULL deref
We can't invalidate xhlocks when we've not yet allocated any. Reported-by: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Fixes: f52be5708076 ("locking/lockdep: Untangle xhlock history save/restore from task independence") Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/locking')
-rw-r--r--kernel/locking/lockdep.c3
1 files changed, 2 insertions, 1 deletions
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)