linux-kernel - [PATCH] net: bpf_jit: fix BPF_S_ALU_AND

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Message-ID: <40f4b91c5200771f223966f368095c63.squirrel@webmail.greenhost.nl>
Date:	Sat, 31 Mar 2012 20:52:09 +1100
From:	"Indan Zupancic" <indan@....nu>
To:	"Eric Dumazet" <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org, stable@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] net: bpf_jit: fix BPF_S_ALU_AND_K compilation

Hello,

Finally, after much searching I found one little bug.

[PATCH] net: bpf_jit: fix BPF_S_ALU_AND_K compilation

Small typo resulted in bad code generation for certain
values of K for the BPF_S_ALU_AND_K instruction.

Signed-off-by: Indan Zupancic <indan@....nu>
---

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index 7c1b765..28bc807 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -289,7 +289,7 @@ void bpf_jit_compile(struct sk_filter *fp)
 					EMIT2(0x24, K & 0xFF); /* and imm8,%al */
 				} else if (K >= 0xFFFF0000) {
 					EMIT2(0x66, 0x25);	/* and imm16,%ax */
-					EMIT2(K, 2);
+					EMIT(K, 2);
 				} else {
 					EMIT1_off32(0x25, K);	/* and imm32,%eax */
 				}


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