linux-kernel - Re: [PATCH -mm 1/2] 3c59x: Fix uninitialized variable bug

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Message-ID: <alpine.LFD.0.999.0709041407210.13651@enigma.security.iitk.ac.in>
Date:	Tue, 4 Sep 2007 14:09:47 +0530 (IST)
From:	Satyam Sharma <satyam@...radead.org>
To:	Steffen Klassert <klassert@...hematik.tu-chemnitz.de>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Netdev Mailing List <netdev@...r.kernel.org>,
	Jeff Garzik <jeff@...zik.org>,
	Mark Hindley <mark@...dley.org.uk>
Subject: Re: [PATCH -mm 1/2] 3c59x: Fix uninitialized variable bug

Hi Steffen,


On Tue, 4 Sep 2007, Steffen Klassert wrote:

> On Tue, Sep 04, 2007 at 03:45:55AM +0530, Satyam Sharma wrote:
> > 
> > drivers/net/3c59x.c: In function 'vortex_up':
> > drivers/net/3c59x.c:1495: warning: 'err' may be used uninitialized in this function
> 
> This came in with the recently applied 3c59x-check-return-of-pci_enable_device patch
> from Mark Hindley. I just compiled it on a PCI only machine so far, therefore I did
> not notice the warning yet.

Hmm, the .config I built with had PCI=y as well. Probably a compiler
version difference -- Jeff also mentioned yesterday that some newer
GCC versions fail to warn about uninitialized variables cases.


> > is a genuine bug. The function returns an uninitialized value of 'err'
> > back to the caller, which expects it to be 0 for success cases. Let's
> > fix this by explicitly initializing 'err' to zero.
> > 
> > Signed-off-by: Satyam Sharma <satyam@...radead.org>
> Acked-by: Steffen Klassert <klassert@...hematik.tu-chemnitz.de>


Thanks,

Satyam
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