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libbpf: check map name retrieved from ELF

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Validate there was no error retrieving symbol name corresponding to
a BPF map.

Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Andrii Nakryiko 2019-05-29 10:36:06 -07:00 • committed by Daniel Borkmann
parent 12ef5634a8
commit c51829bb6e
1 changed files with 5 additions and 0 deletions
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5
tools/lib/bpf/libbpf.c
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@ -920,6 +920,11 @@ bpf_object__init_maps(struct bpf_object *obj, int flags)
map_name = elf_strptr(obj->efile.elf,
obj->efile.strtabidx,
sym.st_name);
if (!map_name) {
pr_warning("failed to get map #%d name sym string for obj %s\n",
map_idx, obj->path);
return -LIBBPF_ERRNO__FORMAT;
}
obj->maps[map_idx].libbpf_type = LIBBPF_MAP_UNSPEC;
obj->maps[map_idx].offset = sym.st_value;