[PATCH] perf record: Fix failed memory allocation for get_cpuid_str

[Thomas Richter]

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@xxxxxxxxxxxxxxxxxx>
---
 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 33027c5e6f92..c6b5204e0280 100644
--- a/tools/perf/arch/x86/util/header.c
+++ b/tools/perf/arch/x86/util/header.c
@@ -70,7 +70,7 @@ get_cpuid_str(void)
 {
 	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;
 	}
-- 
2.13.4