linux-kernel - [tip:perf/core] perf record: Fix failed memory allocation for get_cpuid

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Date:   Wed, 17 Jan 2018 08:38:21 -0800
From:   tip-bot for Thomas Richter <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, schwidefsky@...ibm.com, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, mingo@...nel.org, acme@...hat.com,
        brueckner@...ux.vnet.ibm.com, heiko.carstens@...ibm.com,
        tmricht@...ux.vnet.ibm.com
Subject: [tip:perf/core] perf record: Fix failed memory allocation for
 get_cpuid_str

Commit-ID:  81fccd6ca507d3b2012eaf1edeb9b1dbf4bd22db
Gitweb:     https://git.kernel.org/tip/81fccd6ca507d3b2012eaf1edeb9b1dbf4bd22db
Author:     Thomas Richter <tmricht@...ux.vnet.ibm.com>
AuthorDate: Wed, 17 Jan 2018 14:16:11 +0100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 17 Jan 2018 10:31:25 -0300

perf record: Fix failed memory allocation for get_cpuid_str

In x86 architecture dependend part function get_cpuid_str() mallocs a
128 byte buffer, but does not check if the memory allocation succeeded
or not.

When the memory allocation fails, function __get_cpuid() is called with
first parameter being a NULL pointer.  However this function references
its first parameter and operates on a NULL pointer which might cause
core dumps.

Signed-off-by: Thomas Richter <tmricht@...ux.vnet.ibm.com>
Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
Link: http://lkml.kernel.org/r/20180117131611.34319-1-tmricht@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/arch/x86/util/header.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/arch/x86/util/header.c b/tools/perf/arch/x86/util/header.c
index b626d2b..fb0d71a 100644
--- a/tools/perf/arch/x86/util/header.c
+++ b/tools/perf/arch/x86/util/header.c
@@ -70,7 +70,7 @@ get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
 {
 	char *buf = malloc(128);
 
-	if (__get_cpuid(buf, 128, "%s-%u-%X$") < 0) {
+	if (buf && __get_cpuid(buf, 128, "%s-%u-%X$") < 0) {
 		free(buf);
 		return NULL;
 	}