* [PATCH] perf record: Fix failed memory allocation for get_cpuid_str
@ 2018-01-17 13:16 Thomas Richter
2018-01-17 13:31 ` Arnaldo Carvalho de Melo
0 siblings, 1 reply; 2+ messages in thread
From: Thomas Richter @ 2018-01-17 13:16 UTC (permalink / raw)
To: linux-kernel, linux-perf-users, acme
Cc: brueckner, schwidefsky, heiko.carstens, 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@linux.vnet.ibm.com>
---
| 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] perf record: Fix failed memory allocation for get_cpuid_str
2018-01-17 13:16 [PATCH] perf record: Fix failed memory allocation for get_cpuid_str Thomas Richter
@ 2018-01-17 13:31 ` Arnaldo Carvalho de Melo
0 siblings, 0 replies; 2+ messages in thread
From: Arnaldo Carvalho de Melo @ 2018-01-17 13:31 UTC (permalink / raw)
To: Thomas Richter
Cc: linux-kernel, linux-perf-users, brueckner, schwidefsky,
heiko.carstens
Em Wed, Jan 17, 2018 at 02:16:11PM +0100, Thomas Richter escreveu:
> 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.
Thanks, applied.
- Arnaldo
> Signed-off-by: Thomas Richter <tmricht@linux.vnet.ibm.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 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
^ permalink raw reply [flat|nested] 2+ messages in thread
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2018-01-17 13:31 ` Arnaldo Carvalho de Melo
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