linux-kernel - Re: [PATCH][stable] b44 WOL setup: one-bit-off stack corruption kernel panic fix

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Date:	Wed, 02 Dec 2009 15:42:20 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	sbrabec@...e.cz
Cc:	zambrano@...adcom.com, linux-kernel@...r.kernel.org,
	stable@...nel.org
Subject: Re: [PATCH][stable] b44 WOL setup: one-bit-off stack corruption
 kernel panic fix

From: Stanislav Brabec <sbrabec@...e.cz>
Date: Wed, 02 Dec 2009 15:35:20 +0100

> Stanislav Brabec wrote:
>> About 50% of shutdowns of b44 Ethernet adapter ends by kernel panic with
>> kernels compiled with stack-protector.
>> 
>> Checking b44_magic_pattern() return values, one call of
>> b44_magic_pattern() returns 127. It means, that set_bit(128, pmask) was
>> called on line 1509. It means that bit 0 of 17th byte of pmask was
>> overwritten. But pmask has only 16 bytes. Stack corruption happens.
>>  
>> It seems that set_bit() on line 1509 always writes one bit off.
>> 
>> The fix does not only solve the stack corruption, but also makes Wake On
>> LAN working on my onboard B44 on Asus A7V-333X mainboard.
>> 
>> It seems that this problem affects all kernel versions since commit
>> 725ad800 on 2006-06-20.
> 
> stable@...nel.org may be interested as well. Adding Cc:.

netdev@...r.kernel.org is even more interested.  Please post all
networking patches CC:'d there so they get properly logged
and tracked in patchwork.

Thank you.
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