[PATCH 5.10 073/406] selftests/resctrl: Dont leak buffer in fill_cache()

Greg Kroah-Hartman
2023-09-17T19:22:34Z

From: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

[ Upstream commit 2d320b1029ee7329ee0638181be967789775b962 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
tools/testing/selftests/resctrl/fill_buf.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/resctrl/fill_buf.c b/tools/testing/selftests/resctrl/fill_buf.c
index c20d0a7ecbe63..ab1d91328d67b 100644
--- a/tools/testing/selftests/resctrl/fill_buf.c
+++ b/tools/testing/selftests/resctrl/fill_buf.c
@@ -184,12 +184,13 @@ 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;
}
--
2.40.1