linux-kernel - [PATCH][RFC] Sound, Xonar, CS43xx: Don't overrun static array

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Date:	Thu, 20 Jan 2011 22:37:43 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	linux-kernel@...r.kernel.org
cc:	alsa-devel@...a-project.org, Takashi Iwai <tiwai@...e.de>,
	Jaroslav Kysela <perex@...ex.cz>,
	Clemens Ladisch <clemens@...isch.de>
Subject: [PATCH][RFC] Sound, Xonar, CS43xx: Don't overrun static array


'cs4398_regs' in 'struct xonar_cs43xx' is an array of 'u8' with a size of 
8. So, this code in sound/pci/oxygen/xonar_cs43xx.c::dump_d1_registers()

    		for (i = 2; i <= 8; ++i)
	  			snd_iprintf(buffer, " %02x", data->cs4398_regs[i]);

will overrun the array when 'i == 8'.

I guess that what's needed to fix it is the trivial patch below, but I 
must admit that I have no idea about this code, so I may very well be 
wrong. Additionally, I have no way to actually test this, so all I know is 
that the below compiles. Someone who actually knows this code should take 
a look before anything is comitted - consider the below (not much more 
than) a bug report.

Signed-off-by: Jesper Juhl <jj@...osbits.net>
---
 xonar_cs43xx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/pci/oxygen/xonar_cs43xx.c b/sound/pci/oxygen/xonar_cs43xx.c
index 9f72d42..2527191 100644
--- a/sound/pci/oxygen/xonar_cs43xx.c
+++ b/sound/pci/oxygen/xonar_cs43xx.c
@@ -392,7 +392,7 @@ static void dump_d1_registers(struct oxygen *chip,
 	unsigned int i;
 
 	snd_iprintf(buffer, "\nCS4398: 7?");
-	for (i = 2; i <= 8; ++i)
+	for (i = 2; i < 8; ++i)
 		snd_iprintf(buffer, " %02x", data->cs4398_regs[i]);
 	snd_iprintf(buffer, "\n");
 	dump_cs4362a_registers(data, buffer);

-- 
Jesper Juhl <jj@...osbits.net>            http://www.chaosbits.net/
Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html
Plain text mails only, please.

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