diff --git a/net/core/filter.c b/net/core/filter.c index 765556ba32efba29ccdd8269a2c4f9a7b4a092dc..e08b3822c72a8bb67eeb4e8c3f139aebdb7b9d5a 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -295,43 +295,43 @@ unsigned int __sk_run_filter(void *ctx, const struct sock_filter_int *insn) (*(s64 *) &A) >>= K; CONT; BPF_ALU64_BPF_MOD_BPF_X: + if (unlikely(X == 0)) + return 0; tmp = A; - if (X) - A = do_div(tmp, X); + A = do_div(tmp, X); CONT; BPF_ALU_BPF_MOD_BPF_X: + if (unlikely(X == 0)) + return 0; tmp = (u32) A; - if (X) - A = do_div(tmp, (u32) X); + A = do_div(tmp, (u32) X); CONT; BPF_ALU64_BPF_MOD_BPF_K: tmp = A; - if (K) - A = do_div(tmp, K); + A = do_div(tmp, K); CONT; BPF_ALU_BPF_MOD_BPF_K: tmp = (u32) A; - if (K) - A = do_div(tmp, (u32) K); + A = do_div(tmp, (u32) K); CONT; BPF_ALU64_BPF_DIV_BPF_X: - if (X) - do_div(A, X); + if (unlikely(X == 0)) + return 0; + do_div(A, X); CONT; BPF_ALU_BPF_DIV_BPF_X: + if (unlikely(X == 0)) + return 0; tmp = (u32) A; - if (X) - do_div(tmp, (u32) X); + do_div(tmp, (u32) X); A = (u32) tmp; CONT; BPF_ALU64_BPF_DIV_BPF_K: - if (K) - do_div(A, K); + do_div(A, K); CONT; BPF_ALU_BPF_DIV_BPF_K: tmp = (u32) A; - if (K) - do_div(tmp, (u32) K); + do_div(tmp, (u32) K); A = (u32) tmp; CONT; BPF_ALU_BPF_END_BPF_TO_BE: