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    Subject[PATCH 5.15 02/72] selftests: x86: fix [-Wstringop-overread] warn in test_process_vm_readv()
    Date
    From: Shuah Khan <skhan@linuxfoundation.org>

    commit dd40f44eabe1e122c6852fabb298aac05b083fce upstream.

    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>
    Cc: Naresh Kamboju <naresh.kamboju@linaro.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    tools/testing/selftests/x86/test_vsyscall.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- 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");

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