From: Liming Wang <liming.wang@windriver.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
Paul Mackerras <paulus@samba.org>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
linux-kernel@vger.kernel.org,
Liming Wang <liming.wang@windriver.com>
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 [thread overview]
Message-ID: <1262172487-13694-1-git-send-email-liming.wang@windriver.com> (raw)
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
next reply other threads:[~2009-12-30 11:55 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-30 11:28 Liming Wang [this message]
2009-12-30 12:28 ` Peter Zijlstra
2009-12-30 14:36 ` Wang Liming
2009-12-30 15:08 ` Peter Zijlstra
2009-12-30 15:02 ` Wang Liming
2009-12-31 14:30 ` [tip:perf/urgent] perf: Fix NULL deref in inheritance code tip-bot for Peter Zijlstra
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