From: zhuangfeiran@ict.ac.cn <zhuangfeiran@ict.ac.cn>
Date: Wed, 28 Mar 2012 23:27:00 +0000 (+0000)
Subject: x86 bpf_jit: fix a bug in emitting the 16-bit immediate operand of AND
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=1d24fb3684f347226747c6b11ea426b7b992694e;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

x86 bpf_jit: fix a bug in emitting the 16-bit immediate operand of AND

When K >= 0xFFFF0000, AND needs the two least significant bytes of K as
its operand, but EMIT2() gives it the least significant byte of K and
0x2. EMIT() should be used here to replace EMIT2().

Signed-off-by: Feiran Zhuang  <zhuangfeiran@ict.ac.cn>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index 5671752f8d9c..5a5b6e4dd738 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 */
 				}