bpf: mark PTR_TO_MEM as non-null register type

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PTR_TO_MEM register without PTR_MAYBE_NULL is indeed non-null. This is
important for BPF verifier to be able to prune guaranteed not to be
taken branches. This is always the case with open-coded iterators.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20230302235015.2044271-11-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Andrii Nakryiko 2023-03-02 15:50:08 -08:00 • committed by Alexei Starovoitov

parent d0e1ac2279

commit d5271c5b19

1 changed files with 2 additions and 1 deletions

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kernel/bpf/verifier.c

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