linux-kernel - Re: [PATCH] fix a bug in emitting the 16-bit immediate operand of AND

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Date:	Thu, 29 Mar 2012 18:13:11 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	zhuangfeiran@....ac.cn, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix a bug in emitting the 16-bit immediate operand of
 AND

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 29 Mar 2012 13:45:25 +0200

> Le jeudi 29 mars 2012 à 17:27 +0800, zhuangfeiran@....ac.cn a écrit :
>> 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>
>> ---
>>  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 */
>>  				}
> 
> Good catch, thanks !
> 
> Acked-by: Eric Dumazet <eric.dumazet@...il.com>

Applied.
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