From: David Daney Date: Tue, 14 Mar 2017 21:21:42 +0000 (-0700) Subject: MIPS: BPF: Use unsigned access for unsigned SKB fields. X-Git-Tag: v4.12-rc1~18^2~36 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=64b2dd3a8be3ec4e08fd5a3dab0620d9c6c398fe;p=linux.git MIPS: BPF: Use unsigned access for unsigned SKB fields. The SKB vlan_tci and queue_mapping fields are unsigned, don't sign extend these in the BPF JIT. In the vlan_tci case, the value gets masked so the change is not needed for correctness, but do it anyway for agreement with the types defined in struct sk_buff. Signed-off-by: David Daney Cc: James Hogan Cc: Alexei Starovoitov Cc: Steven J. Hill Cc: linux-mips@linux-mips.org Cc: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/15746/ Signed-off-by: Ralf Baechle --- diff --git a/arch/mips/net/bpf_jit.c b/arch/mips/net/bpf_jit.c index 880e329310ee..a68cd36a892f 100644 --- a/arch/mips/net/bpf_jit.c +++ b/arch/mips/net/bpf_jit.c @@ -1156,7 +1156,7 @@ static int build_body(struct jit_ctx *ctx) BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_tci) != 2); off = offsetof(struct sk_buff, vlan_tci); - emit_half_load(r_s0, r_skb, off, ctx); + emit_half_load_unsigned(r_s0, r_skb, off, ctx); if (code == (BPF_ANC | SKF_AD_VLAN_TAG)) { emit_andi(r_A, r_s0, (u16)~VLAN_TAG_PRESENT, ctx); } else { @@ -1183,7 +1183,7 @@ static int build_body(struct jit_ctx *ctx) BUILD_BUG_ON(offsetof(struct sk_buff, queue_mapping) > 0xff); off = offsetof(struct sk_buff, queue_mapping); - emit_half_load(r_A, r_skb, off, ctx); + emit_half_load_unsigned(r_A, r_skb, off, ctx); break; default: pr_debug("%s: Unhandled opcode: 0x%02x\n", __FILE__,