From c5d22f4cfe8dfb93f1db0a1e7e2e7ebc41395d98 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Tue, 19 Jul 2022 12:50:32 +0300 Subject: [PATCH] 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 Acked-by: Martin KaFai Lau Link: https://lore.kernel.org/r/YtZ+aD/tZMkgOUw+@kili Signed-off-by: Alexei Starovoitov --- tools/testing/selftests/bpf/prog_tests/btf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/prog_tests/btf.c b/tools/testing/selftests/bpf/prog_tests/btf.c index 941b0100bafa..ef6528b8084c 100644 --- 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; -- 2.20.1