diff options
Diffstat (limited to 'kernel/bpf')
| -rw-r--r-- | kernel/bpf/verifier.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 673f414cf34f..5d8f352faebd 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -2189,7 +2189,12 @@ static int backtrack_insn(struct bpf_verifier_env *env, int idx, if (class == BPF_ALU || class == BPF_ALU64) { if (!(*reg_mask & dreg)) return 0; - if (opcode == BPF_MOV) { + if (opcode == BPF_END || opcode == BPF_NEG) { + /* sreg is reserved and unused + * dreg still need precision before this insn + */ + return 0; + } else if (opcode == BPF_MOV) { if (BPF_SRC(insn->code) == BPF_X) { /* dreg = sreg * dreg needs precision after this insn |