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

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[ Upstream commit c5d22f4cfe8dfb93f1db0a1e7e2e7ebc41395d98 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Carpenter 2022-07-19 12:50:32 +03:00 committed by Greg Kroah-Hartman
parent 20fd1c3156
commit 4a5ae176fd
1 changed files with 1 additions and 1 deletions
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2
tools/testing/selftests/bpf/prog_tests/btf.c
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@ -5324,7 +5324,7 @@ 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;