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d0f0104341
kernel/bpf/btf.c:4023 btf_distill_func_proto()
error: potentially dereferencing uninitialized 't'.
kernel/bpf/btf.c
4012 nargs = btf_type_vlen(func);
4013 if (nargs >= MAX_BPF_FUNC_ARGS) {
4014 bpf_log(log,
4015 "The function %s has %d arguments. Too many.\n",
4016 tname, nargs);
4017 return -EINVAL;
4018 }
4019 ret = __get_type_size(btf, func->type, &t);
^^
t isn't initialized for the first -EINVAL return
This is unlikely path, since BTF should have been validated at this point.
Fix it by returning 'void' BTF.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20191126230106.237179-1-ast@kernel.org
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|---|---|---|
| .. | ||
| arraymap.c | ||
| bpf_lru_list.c | ||
| bpf_lru_list.h | ||
| btf.c | ||
| cgroup.c | ||
| core.c | ||
| cpumap.c | ||
| devmap.c | ||
| disasm.c | ||
| disasm.h | ||
| hashtab.c | ||
| helpers.c | ||
| inode.c | ||
| local_storage.c | ||
| lpm_trie.c | ||
| Makefile | ||
| map_in_map.c | ||
| map_in_map.h | ||
| offload.c | ||
| percpu_freelist.c | ||
| percpu_freelist.h | ||
| queue_stack_maps.c | ||
| reuseport_array.c | ||
| stackmap.c | ||
| syscall.c | ||
| sysfs_btf.c | ||
| tnum.c | ||
| trampoline.c | ||
| verifier.c | ||
| xskmap.c | ||