elf_sym_iter_new() calculates the number of symbols by dividing the symbol table data size by sh_entsize. A malformed ELF file with a zero sh_entsize causes a division by zero. Reject symbol table sections with a zero entry size before calculating the number of symbols. Signed-off-by: Luis Vieira --- tools/lib/bpf/elf.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tools/lib/bpf/elf.c b/tools/lib/bpf/elf.c index fe136d025967..ba0b3df37a59 100644 --- a/tools/lib/bpf/elf.c +++ b/tools/lib/bpf/elf.c @@ -118,6 +118,11 @@ static int elf_sym_iter_new(struct elf_sym_iter *iter, if (!gelf_getshdr(scn, &sh)) return -EINVAL; + if (!sh.sh_entsize) { + pr_warn("elf: symbol table section has zero entry size in '%s'\n", binary_path); + return -EINVAL; + } + iter->strtabidx = sh.sh_link; iter->syms = elf_getdata(scn, 0); if (!iter->syms) { --- base-commit: 10c4f610b215bf961235141161992f010cf7e451 change-id: 20260916-libbpf-elf-entsize-fix-a0f9440e79c7 Best regards, -- Luis Vieira