diff mbox series

[bpf-next,4/5] selftest/bpf: Fix memory leak in kprobe_multi_test

Message ID 20221009131830.395569-5-xukuohai@huaweicloud.com
State Superseded
Headers show
Series Fix bugs found by ASAN when running selftests | expand

Commit Message

Xu Kuohai Oct. 9, 2022, 1:18 p.m. UTC 
From: Xu Kuohai <xukuohai@huawei.com>

The get_syms() function in kprobe_multi_test.c does not free the string
memory allocated by sscanf correctly. Fix it.

Signed-off-by: Xu Kuohai <xukuohai@huawei.com>
---
 .../bpf/prog_tests/kprobe_multi_test.c          | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

Comments

Jiri Olsa Oct. 10, 2022, 9:01 a.m. UTC | #1 
On Sun, Oct 09, 2022 at 09:18:29AM -0400, Xu Kuohai wrote:
> From: Xu Kuohai <xukuohai@huawei.com>
> 
> The get_syms() function in kprobe_multi_test.c does not free the string
> memory allocated by sscanf correctly. Fix it.
> 
> Signed-off-by: Xu Kuohai <xukuohai@huawei.com>
> ---
>  .../bpf/prog_tests/kprobe_multi_test.c          | 17 ++++++++---------
>  1 file changed, 8 insertions(+), 9 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
> index d457a55ff408..07dd2c5b7f98 100644
> --- a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
> +++ b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
> @@ -360,15 +360,14 @@ static int get_syms(char ***symsp, size_t *cntp)
>  		 * to them. Filter out the current culprits - arch_cpu_idle
>  		 * and rcu_* functions.
>  		 */
> -		if (!strcmp(name, "arch_cpu_idle"))
> -			continue;
> -		if (!strncmp(name, "rcu_", 4))
> -			continue;
> -		if (!strcmp(name, "bpf_dispatcher_xdp_func"))
> -			continue;
> -		if (!strncmp(name, "__ftrace_invalid_address__",
> -			     sizeof("__ftrace_invalid_address__") - 1))
> +		if (!strcmp(name, "arch_cpu_idle") ||
> +			!strncmp(name, "rcu_", 4) ||
> +			!strcmp(name, "bpf_dispatcher_xdp_func") ||
> +			!strncmp(name, "__ftrace_invalid_address__",
> +				 sizeof("__ftrace_invalid_address__") - 1)) {
> +			free(name);
>  			continue;
> +		}
>  		err = hashmap__add(map, name, NULL);
>  		if (err) {
>  			free(name);
> @@ -394,7 +393,7 @@ static int get_syms(char ***symsp, size_t *cntp)
>  	hashmap__free(map);
>  	if (err) {
>  		for (i = 0; i < cnt; i++)
> -			free(syms[cnt]);
> +			free(syms[i]);

mama mia.. nice catch! thanks

Acked-by: Jiri Olsa <jolsa@kernel.org>

jirka

>  		free(syms);
>  	}
>  	return err;
> -- 
> 2.25.1
>
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
index d457a55ff408..07dd2c5b7f98 100644
--- a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
@@ -360,15 +360,14 @@  static int get_syms(char ***symsp, size_t *cntp)
 		 * to them. Filter out the current culprits - arch_cpu_idle
 		 * and rcu_* functions.
 		 */
-		if (!strcmp(name, "arch_cpu_idle"))
-			continue;
-		if (!strncmp(name, "rcu_", 4))
-			continue;
-		if (!strcmp(name, "bpf_dispatcher_xdp_func"))
-			continue;
-		if (!strncmp(name, "__ftrace_invalid_address__",
-			     sizeof("__ftrace_invalid_address__") - 1))
+		if (!strcmp(name, "arch_cpu_idle") ||
+			!strncmp(name, "rcu_", 4) ||
+			!strcmp(name, "bpf_dispatcher_xdp_func") ||
+			!strncmp(name, "__ftrace_invalid_address__",
+				 sizeof("__ftrace_invalid_address__") - 1)) {
+			free(name);
 			continue;
+		}
 		err = hashmap__add(map, name, NULL);
 		if (err) {
 			free(name);
@@ -394,7 +393,7 @@  static int get_syms(char ***symsp, size_t *cntp)
 	hashmap__free(map);
 	if (err) {
 		for (i = 0; i < cnt; i++)
-			free(syms[cnt]);
+			free(syms[i]);
 		free(syms);
 	}
 	return err;