linux-kernel - [PATCH v2] hw breakpoint: Fix a possible memory leak

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1330391978-28070-1-git-send-email-namhyung.kim@lge.com>
Date:	Tue, 28 Feb 2012 10:19:38 +0900
From:	Namhyung Kim <namhyung.kim@....com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	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 v2] hw breakpoint: Fix a possible memory leak

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

Thanks to Peter Zijlstra for suggesting this better solution. It
should work as long as the initial value of the region is all 0's
and that's the case of static (per-cpu) memory allocation.

Signed-off-by: Namhyung Kim <namhyung.kim@....com>
Acked-by: Frederic Weisbecker <fweisbec@...il.com>
---
 kernel/events/hw_breakpoint.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/events/hw_breakpoint.c b/kernel/events/hw_breakpoint.c
index b0309f76d777..3330022a7ac1 100644
--- a/kernel/events/hw_breakpoint.c
+++ b/kernel/events/hw_breakpoint.c
@@ -658,10 +658,10 @@ int __init init_hw_breakpoint(void)
 
  err_alloc:
 	for_each_possible_cpu(err_cpu) {
-		if (err_cpu == cpu)
-			break;
 		for (i = 0; i < TYPE_MAX; i++)
 			kfree(per_cpu(nr_task_bp_pinned[i], cpu));
+		if (err_cpu == cpu)
+			break;
 	}
 
 	return -ENOMEM;
-- 
1.7.9

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/