| Message ID | 20210913110246.2955737-1-mudongliangabcd@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | bpf: fix kmalloc bug in bpf_check | expand |
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 047ac4b4703b..3c5a79f78bc5 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -9913,6 +9913,9 @@ static int check_btf_line(struct bpf_verifier_env *env, if (!nr_linfo) return 0; + if (nr_linfo > INT_MAX/sizeof(struct bpf_line_info)) + return -EINVAL; + rec_size = attr->line_info_rec_size; if (rec_size < MIN_BPF_LINEINFO_SIZE || rec_size > MAX_LINEINFO_REC_SIZE ||
Since 7661809d493b ("mm: don't allow oversized kvmalloc() calls ") does not allow oversized kvmalloc, it triggers a kmalloc bug warning at bpf_check. Fix it by adding a sanity check in th check_btf_line. Reported-by: syzbot+f3e749d4c662818ae439@syzkaller.appspotmail.com Fixes: 7661809d493b ("mm: don't allow oversized kvmalloc() calls") Signed-off-by: Dongliang Mu <mudongliangabcd@gmail.com> --- kernel/bpf/verifier.c | 3 +++ 1 file changed, 3 insertions(+)