linux-kernel - [tip:perf/core] perf_events: Fix invalid pointer when pid is invalid

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Message-ID: <tip-540804b5c52065a87d826f7714b18a3ec0b269f9@git.kernel.org>
Date:	Mon, 4 Oct 2010 20:35:31 GMT
From:	tip-bot for Stephane Eranian <eranian@...gle.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, eranian@...gle.com, hpa@...or.com,
	mingo@...hat.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/core] perf_events: Fix invalid pointer when pid is invalid

Commit-ID:  540804b5c52065a87d826f7714b18a3ec0b269f9
Gitweb:     http://git.kernel.org/tip/540804b5c52065a87d826f7714b18a3ec0b269f9
Author:     Stephane Eranian <eranian@...gle.com>
AuthorDate: Mon, 4 Oct 2010 12:00:02 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Mon, 4 Oct 2010 12:47:20 +0200

perf_events: Fix invalid pointer when pid is invalid

This patch fixes an error in perf_event_open() when the pid
provided by the user is invalid. find_lively_task_by_vpid()
does not return NULL on error but an error code. Without the
fix the error code was silently passed to find_get_context()
which would eventually cause a invalid pointer dereference.

Signed-off-by: Stephane Eranian <eranian@...gle.com>
Cc: peterz@...radead.org
Cc: paulus@...ba.org
Cc: davem@...emloft.net
Cc: fweisbec@...il.com
Cc: perfmon2-devel@...ts.sf.net
Cc: eranian@...il.com
Cc: robert.richter@....com
LKML-Reference: <4ca9a5d1.e8e9d80a.3dbb.ffff8f2e@...google.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/perf_event.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index c16158c..64507ea 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -5616,8 +5616,13 @@ SYSCALL_DEFINE5(perf_event_open,
 		}
 	}
 
-	if (pid != -1)
+	if (pid != -1) {
 		task = find_lively_task_by_vpid(pid);
+		if (IS_ERR(task)) {
+			err = PTR_ERR(task);
+			goto err_group_fd;
+		}
+	}
 
 	/*
 	 * Get the target context (task or percpu):
--
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