From 6e86c59d4d0d04e7ebefd05b8af245c968892f81 Mon Sep 17 00:00:00 2001 From: Markos Chandras Date: Mon, 23 Jun 2014 10:38:52 +0100 Subject: [PATCH] MIPS: bpf: Use correct mask for VLAN_TAG case Using VLAN_VID_MASK is not correct to get the vlan tag. Use ~VLAN_PRESENT_MASK instead and make sure it's u16 so the top 16-bits will be removed. This will ensure that the emit_andi() code will not treat this as a big 32-bit unsigned value. Signed-off-by: Markos Chandras Cc: David S. Miller Cc: Daniel Borkmann Cc: Alexei Starovoitov Cc: netdev@vger.kernel.org Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/7127/ Signed-off-by: Ralf Baechle --- arch/mips/net/bpf_jit.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/mips/net/bpf_jit.c b/arch/mips/net/bpf_jit.c index 500f97f..a4d1b76 100644 --- a/arch/mips/net/bpf_jit.c +++ b/arch/mips/net/bpf_jit.c @@ -1317,7 +1317,7 @@ jmp_cmp: off = offsetof(struct sk_buff, vlan_tci); emit_half_load(r_s0, r_skb, off, ctx); if (code == (BPF_ANC | SKF_AD_VLAN_TAG)) - emit_andi(r_A, r_s0, VLAN_VID_MASK, ctx); + emit_andi(r_A, r_s0, (u16)~VLAN_TAG_PRESENT, ctx); else emit_andi(r_A, r_s0, VLAN_TAG_PRESENT, ctx); break; -- 2.7.4