perf/core: Fix potential NULL deref
commit a71ef31485bb51b846e8db8b3a35e432cc15afb5 upstream.
Smatch is awesome.
BUG=b/308500870
TEST=presubmit
RELEASE_NOTE=None
cos-patch: security-high
Fixes: 32671e3799ca ("perf: Disallow mis-matched inherited group reads")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Change-Id: I3cca9efec58dcd706db199a98f81d27c7ebefeee
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/60239
Reviewed-by: Arnav Kansal <rnv@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 2b8315a9..8f2b9d8 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -13293,7 +13293,8 @@
!perf_get_aux_event(child_ctr, leader))
return -EINVAL;
}
- leader->group_generation = parent_event->group_generation;
+ if (leader)
+ leader->group_generation = parent_event->group_generation;
return 0;
}
