[PATCH] selftests/mm/mkdirty: Fix memory leak in test_uffdio_copy()

[liuye]

    Release memory before exception branch returns to prevent memory leaks

Checking tools/testing/selftests/mm/mkdirty.c ...
tools/testing/selftests/mm/mkdirty.c:283:3: error: Memory leak: src [memleak]
  return;
  ^

Signed-off-by: liuye <li...@kylinos.cn>
---
 tools/testing/selftests/mm/mkdirty.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/mm/mkdirty.c 
b/tools/testing/selftests/mm/mkdirty.c
index 1db134063c38..af2fce496912 100644
--- a/tools/testing/selftests/mm/mkdirty.c
+++ b/tools/testing/selftests/mm/mkdirty.c
@@ -280,6 +280,7 @@ static void test_uffdio_copy(void)
        dst = mmap(NULL, pagesize, PROT_READ, MAP_PRIVATE|MAP_ANON, -1, 0);
        if (dst == MAP_FAILED) {
                ksft_test_result_fail("mmap() failed\n");
+               free(src);
                return;
        }
 
-- 
2.25.1