selftests/bpf: fix a test for snprintf() overflow

The snprintf() function returns the number of bytes which *would*
have been copied if there were space.  In other words, it can be
> sizeof(pin_path).

Fixes: c0fa1b6c3efc ("bpf: btf: Add BTF tests")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/YtZ+aD/tZMkgOUw+@kili
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/tools/testing/selftests/bpf/prog_tests/btf.c b/tools/testing/selftests/bpf/prog_tests/btf.c
index 941b010..ef6528b 100644 (file)
--- a/tools/testing/selftests/bpf/prog_tests/btf.c
+++ b/tools/testing/selftests/bpf/prog_tests/btf.c
@@ -5338,7 +5338,7 @@ static void do_test_pprint(int test_num)
        ret = snprintf(pin_path, sizeof(pin_path), "%s/%s",
                       "/sys/fs/bpf", test->map_name);
 
-       if (CHECK(ret == sizeof(pin_path), "pin_path %s/%s is too long",
+       if (CHECK(ret >= sizeof(pin_path), "pin_path %s/%s is too long",
                  "/sys/fs/bpf", test->map_name)) {
                err = -1;
                goto done;