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authorLinus Torvalds <torvalds@linux-foundation.org>2015-03-28 11:12:08 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-03-28 11:12:08 -0700
commitee9b63dd0fed60565829b489d29f80927a6fcf3d (patch)
tree6e7bf7417151024bc6c21e235ce6fbe81a84babd
parent0fa7271a8a4e957c82b32ee4c81ff22709567d1b (diff)
parentd525211f9d1be8b523ec7633f080f2116f5ea536 (diff)
downloadlinux-ee9b63dd0fed60565829b489d29f80927a6fcf3d.tar.gz
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fix from Ingo Molnar: "A perf kernel side fix for a fuzzer triggered lockup" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf: Fix irq_work 'tail' recursion
-rw-r--r--kernel/events/core.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 453ef61311d..2fabc062716 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -4574,6 +4574,13 @@ static void perf_pending_event(struct irq_work *entry)
{
struct perf_event *event = container_of(entry,
struct perf_event, pending);
+ int rctx;
+
+ rctx = perf_swevent_get_recursion_context();
+ /*
+ * If we 'fail' here, that's OK, it means recursion is already disabled
+ * and we won't recurse 'further'.
+ */
if (event->pending_disable) {
event->pending_disable = 0;
@@ -4584,6 +4591,9 @@ static void perf_pending_event(struct irq_work *entry)
event->pending_wakeup = 0;
perf_event_wakeup(event);
}
+
+ if (rctx >= 0)
+ perf_swevent_put_recursion_context(rctx);
}
/*