linux-kernel - [tip:perf/core] perf/core: Don't leak event in the syscall error path

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Message-ID: <tip-201c2f85bd0bc13b712d9c0b3d11251b182e06ae@git.kernel.org>
Date:	Thu, 31 Mar 2016 02:19:05 -0700
From:	tip-bot for Alexander Shishkin <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	jolsa@...hat.com, acme@...nel.org, tglx@...utronix.de,
	vincent.weaver@...ne.edu, alexander.shishkin@...ux.intel.com,
	hpa@...or.com, acme@...hat.com, chianglungyu@...il.com,
	linux-kernel@...r.kernel.org, eranian@...gle.com, mingo@...nel.org,
	torvalds@...ux-foundation.org, peterz@...radead.org
Subject: [tip:perf/core] perf/core: Don't leak event in the syscall error
 path

Commit-ID:  201c2f85bd0bc13b712d9c0b3d11251b182e06ae
Gitweb:     http://git.kernel.org/tip/201c2f85bd0bc13b712d9c0b3d11251b182e06ae
Author:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>
AuthorDate: Mon, 21 Mar 2016 10:02:42 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 31 Mar 2016 09:54:07 +0200

perf/core: Don't leak event in the syscall error path

In the error path, event_file not being NULL is used to determine
whether the event itself still needs to be free'd, so fix it up to
avoid leaking.

Reported-by: Leon Yu <chianglungyu@...il.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Vince Weaver <vincent.weaver@...ne.edu>
Fixes: 130056275ade ("perf: Do not double free")
Link: http://lkml.kernel.org/r/87twk06yxp.fsf@ashishki-desk.ger.corp.intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/events/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 8c11388..52bedc5 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -8542,6 +8542,7 @@ SYSCALL_DEFINE5(perf_event_open,
 					f_flags);
 	if (IS_ERR(event_file)) {
 		err = PTR_ERR(event_file);
+		event_file = NULL;
 		goto err_context;
 	}