lkml.org 
[lkml]   [2018]   [Jan]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
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@linux.vnet.ibm.com>
AuthorDate: Wed, 17 Jan 2018 14:16:11 +0100
Committer: Arnaldo Carvalho de Melo <acme@redhat.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@linux.vnet.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Link: http://lkml.kernel.org/r/20180117131611.34319-1-tmricht@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.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;
}
\
 
 \ /
  Last update: 2018-01-18 00:21    [W:4.805 / U:0.004 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site