selftests: x86: fix [-Wstringop-overread] warn in test_process_vm_readv()

Fix the following [-Wstringop-overread] by passing in the variable
instead of the value.

test_vsyscall.c: In function ‘test_process_vm_readv’:
test_vsyscall.c:500:22: warning: ‘__builtin_memcmp_eq’ specified bound 4096 exceeds source size 0 [-Wstringop-overread]
  500 |                 if (!memcmp(buf, (const void *)0xffffffffff600000, 4096)) {
      |                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

diff --git a/tools/testing/selftests/x86/test_vsyscall.c b/tools/testing/selftests/x86/test_vsyscall.c
index 65c141e..5b45e69 100644 (file)
--- a/tools/testing/selftests/x86/test_vsyscall.c
+++ b/tools/testing/selftests/x86/test_vsyscall.c
@@ -497,7 +497,7 @@ static int test_process_vm_readv(void)
        }
 
        if (vsyscall_map_r) {
-               if (!memcmp(buf, (const void *)0xffffffffff600000, 4096)) {
+               if (!memcmp(buf, remote.iov_base, sizeof(buf))) {
                        printf("[OK]\tIt worked and read correct data\n");
                } else {
                        printf("[FAIL]\tIt worked but returned incorrect data\n");