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| author | Shung-Hsi Yu <shung-hsi.yu@suse.com> | 2022-10-12 10:23:52 +0800 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2022-10-13 10:53:34 -0700 |
| commit | 35a855509e6ee3442477c8ebc6827b5b5d32a7b5 (patch) | |
| tree | 0008da47b5d124d2ae4f7a6fca5bd01c9dcc0af2 /tools | |
| parent | 51deedc9b8680953437dfe359e5268120de10e30 (diff) | |
| download | lwn-35a855509e6ee3442477c8ebc6827b5b5d32a7b5.tar.gz lwn-35a855509e6ee3442477c8ebc6827b5b5d32a7b5.zip | |
libbpf: Deal with section with no data gracefully
ELF section data pointer returned by libelf may be NULL (if section has
SHT_NOBITS), so null check section data pointer before attempting to
copy license and kversion section.
Fixes: cb1e5e961991 ("bpf tools: Collect version and license from ELF sections")
Signed-off-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20221012022353.7350-3-shung-hsi.yu@suse.com
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/lib/bpf/libbpf.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 2e8ac13de6a0..29e9df0c232b 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -1408,6 +1408,10 @@ static int bpf_object__check_endianness(struct bpf_object *obj) static int bpf_object__init_license(struct bpf_object *obj, void *data, size_t size) { + if (!data) { + pr_warn("invalid license section in %s\n", obj->path); + return -LIBBPF_ERRNO__FORMAT; + } /* libbpf_strlcpy() only copies first N - 1 bytes, so size + 1 won't * go over allowed ELF data section buffer */ @@ -1421,7 +1425,7 @@ bpf_object__init_kversion(struct bpf_object *obj, void *data, size_t size) { __u32 kver; - if (size != sizeof(kver)) { + if (!data || size != sizeof(kver)) { pr_warn("invalid kver section in %s\n", obj->path); return -LIBBPF_ERRNO__FORMAT; } |