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libbpf: Detect corrupted ELF symbols section

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Prevent divide-by-zero if ELF is corrupted and has zero sh_entsize.
Reported by oss-fuzz project.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20211103173213.1376990-2-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2021-11-03 10:32:09 -07:00 committed by Alexei Starovoitov
parent 8388092b25
commit 833907876b
1 changed files with 1 additions and 1 deletions
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tools/lib/bpf/libbpf.c
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@ -3555,7 +3555,7 @@ static int bpf_object__collect_externs(struct bpf_object *obj)
scn = elf_sec_by_idx(obj, obj->efile.symbols_shndx);
sh = elf_sec_hdr(obj, scn);
if (!sh)
if (!sh || sh->sh_entsize != sizeof(Elf64_Sym))
return -LIBBPF_ERRNO__FORMAT;
dummy_var_btf_id = add_dummy_ksym_var(obj->btf);