Messages in this thread Patch in this message | | | From | Liming Wang <> | Subject | [PATCH 1/1] perf_event: add check for group_list if the parent isn't counted | Date | Wed, 30 Dec 2009 19:28:07 +0800 |
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If the parent has no entry in group_list, child_ctx will not be allocated, which will lead dereference of a NULL child_ctx.
Signed-off-by: Liming Wang <liming.wang@windriver.com> --- kernel/perf_event.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/kernel/perf_event.c b/kernel/perf_event.c index 5b987b4..3664c4b 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -5126,6 +5126,8 @@ int perf_event_init_task(struct task_struct *child) */ mutex_lock(&parent_ctx->mutex); + if (list_empty(&parent_ctx->group_list)) + goto exit; /* * We dont have to disable NMIs - we are only looking at * the list, not manipulating it: -- 1.6.0.3
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