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libbpf: Fix potential uninit memory read
In case of BPF_CORE_TYPE_ID_LOCAL we fill out target result explicitly. But targ_res itself isn't initialized in such a case, and subsequent call to bpf_core_patch_insn() might read uninitialized field (like fail_memsz_adjust in this case). So ensure that targ_res is zero-initialized for BPF_CORE_TYPE_ID_LOCAL case. This was reported by Coverity static analyzer. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20211214010032.3843804-1-andrii@kernel.org
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@ -1223,6 +1223,7 @@ int bpf_core_apply_relo_insn(const char *prog_name, struct bpf_insn *insn,
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/* TYPE_ID_LOCAL relo is special and doesn't need candidate search */
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if (relo->kind == BPF_CORE_TYPE_ID_LOCAL) {
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/* bpf_insn's imm value could get out of sync during linking */
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memset(&targ_res, 0, sizeof(targ_res));
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targ_res.validate = false;
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targ_res.poison = false;
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targ_res.orig_val = local_spec->root_type_id;
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