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

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Message-Id: <20091208.210035.37560621.davem@davemloft.net>
Date:	Tue, 08 Dec 2009 21:00:35 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	sbrabec@...e.cz
Cc:	zambrano@...adcom.com, linux-kernel@...r.kernel.org,
	stable@...nel.org, netdev@...r.kernel.org
Subject: Re: [PATCH][stable] b44 WOL setup: one-bit-off stack corruption
 kernel panic fix

From: Stanislav Brabec <sbrabec@...e.cz>
Date: Thu, 03 Dec 2009 15:56:28 +0100

> 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.
> 
> Signed-off-by: Stanislav Brabec <sbrabec@...e.cz>

Applied, thanks.
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