selftests/resctrl: Don't leak buffer in fill_cache()

The error path in fill_cache() does return before the allocated buffer
is freed leaking the buffer.

The leak was introduced when fill_cache_read() started to return errors
in commit c7b607fa9325 ("selftests/resctrl: Fix null pointer
dereference on open failed"), before that both fill functions always
returned 0.

Move free() earlier to prevent the mem leak.

Fixes: c7b607fa9325 ("selftests/resctrl: Fix null pointer dereference on open failed")
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Shaopeng Tan (Fujitsu) <tan.shaopeng@fujitsu.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

diff --git a/tools/testing/selftests/resctrl/fill_buf.c b/tools/testing/selftests/resctrl/fill_buf.c
index 341cc93ca84c4b86535c4fb58043ed52af96ae2e..3b328c844896455d42c7f8032fd5e0e317b8643a 100644 (file)
--- a/tools/testing/selftests/resctrl/fill_buf.c
+++ b/tools/testing/selftests/resctrl/fill_buf.c
@@ -177,12 +177,13 @@ fill_cache(unsigned long long buf_size, int malloc_and_init, int memflush,
        else
                ret = fill_cache_write(start_ptr, end_ptr, resctrl_val);
 
+       free(startptr);
+
        if (ret) {
                printf("\n Error in fill cache read/write...\n");
                return -1;
        }
 
-       free(startptr);
 
        return 0;
 }