linux-kernel - [ 01/42] x86 bpf_jit: fix a bug in emitting the 16-bit immediate operand of AND

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Message-Id: <20120411231307.478617900@linuxfoundation.org>
Date:	Wed, 11 Apr 2012 16:13:08 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Feiran Zhuang <zhuangfeiran@....ac.cn>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 01/42] x86 bpf_jit: fix a bug in emitting the 16-bit immediate operand of AND

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------


From: "zhuangfeiran@....ac.cn" <zhuangfeiran@....ac.cn>

[ Upstream commit 1d24fb3684f347226747c6b11ea426b7b992694e ]

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@....ac.cn>
Acked-by: Eric Dumazet <eric.dumazet@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/x86/net/bpf_jit_comp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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 *f
 					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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