From: "zhuangfeiran@ict.ac.cn" <zhuangfeiran@ict.ac.cn>
To: davem@davemloft.net
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
eric.dumazet@gmail.com
Subject: [PATCH] fix a bug in emitting the 16-bit immediate operand of AND
Date: Thu, 29 Mar 2012 17:27:00 +0800 [thread overview]
Message-ID: <4F742AE4.6050006@ict.ac.cn> (raw)
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>
---
arch/x86/net/bpf_jit_comp.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index 5671752..5a5b6e4 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 */
}
--
1.7.5.4
next reply other threads:[~2012-03-29 9:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-29 9:27 zhuangfeiran [this message]
2012-03-29 11:45 ` [PATCH] fix a bug in emitting the 16-bit immediate operand of AND Eric Dumazet
2012-03-29 22:13 ` David Miller
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