linux-kernel - [PATCH] hw breakpoint: Fix possible memory leak

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Date:	Mon, 27 Feb 2012 12:02:19 +0900
From:	Namhyung Kim <namhyung.kim@....com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Namhyung Kim <namhyung@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] hw breakpoint: Fix possible memory leak

If kzalloc() for TYPE_DATA failed on a given cpu, previous chunk
will be leaked. Fix it.

Signed-off-by: Namhyung Kim <namhyung.kim@....com>
---
 kernel/events/hw_breakpoint.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/kernel/events/hw_breakpoint.c b/kernel/events/hw_breakpoint.c
index b0309f76d777..58298b0d0e92 100644
--- a/kernel/events/hw_breakpoint.c
+++ b/kernel/events/hw_breakpoint.c
@@ -645,8 +645,12 @@ int __init init_hw_breakpoint(void)
 			task_bp_pinned = &per_cpu(nr_task_bp_pinned[i], cpu);
 			*task_bp_pinned = kzalloc(sizeof(int) * nr_slots[i],
 						  GFP_KERNEL);
-			if (!*task_bp_pinned)
+			if (!*task_bp_pinned) {
+				while (--i >= 0)
+					kfree(per_cpu(nr_task_bp_pinned[i],
+						      cpu));
 				goto err_alloc;
+			}
 		}
 	}
 
-- 
1.7.9

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