4.9-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Richter tmricht@linux.vnet.ibm.com
[ Upstream commit 81fccd6ca507d3b2012eaf1edeb9b1dbf4bd22db ]
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 Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- tools/perf/arch/x86/util/header.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/tools/perf/arch/x86/util/header.c +++ b/tools/perf/arch/x86/util/header.c @@ -69,7 +69,7 @@ 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; }