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}; struct Big { long x; long y; }; [...] __noinline int foo(const struct Big *big) { if (!big) return 0; return bpf_get_prandom_u32() < big->y; } [...] SEC("cgroup_skb/ingress") __failure __msg("invalid indirect access to stack") int global_func10(struct __sk_buff *skb) { const struct Small small = {.x = skb->len }; return foo((struct Big *)&small) ? 1 : 0; } GCC emits a "maybe uninitialized" warning for the code above, because it knows `foo' accesses `big->y'. Since the purpose of this selftest is to check that the verifier will fail on this sort of invalid memory access, this patch just silences the compiler warning. Tested in bpf-next master. No regressions. Signed-off-by: Jose E. Marchesi Cc: david.faust@oracle.com Cc: cupertino.miranda@oracle.com Cc: Yonghong Song Cc: Eduard Zingerman --- tools/testing/selftests/bpf/progs/test_global_func10.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tools/testing/selftests/bpf/progs/test_global_func10.c b/tools/testing/selftests/bpf/progs/test_global_func10.c index 8fba3f3649e2..5da001ca57a5 100644 --- a/tools/testing/selftests/bpf/progs/test_global_func10.c +++ b/tools/testing/selftests/bpf/progs/test_global_func10.c @@ -4,6 +4,10 @@ #include #include "bpf_misc.h" +#if !defined(__clang__) +#pragma GCC diagnostic ignored "-Wmaybe-uninitialized" +#endif + struct Small { long x; }; -- 2.30.2