linux-kernel - [PATCH] ipmi: fix uninit'd data bug

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Message-ID: <20061001145841.GA3703@havoc.gtf.org>
Date:	Sun, 1 Oct 2006 10:58:41 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	minyard@....org, LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>
Subject: [PATCH] ipmi: fix uninit'd data bug


gcc issues the following warning:

drivers/char/ipmi/ipmi_si_intf.c: In function ‘init_ipmi_si’:
drivers/char/ipmi/ipmi_si_intf.c:1729: warning: ‘data.irq’ may be used uninitialized in this function

This is indeed a bug.  data.irq is completely uninitialized in some code
paths.  Worse than that, data from a previous decode_dmi() run can
easily leak through successive calls.

Signed-off-by: Jeff Garzik <jeff@...zik.org>

diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index abca98b..0afd7f8 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -1730,6 +1730,7 @@ static void __devinit dmi_find_bmc(void)
 	int                  rv;
 
 	while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev))) {
+		memset(&data, 0, sizeof(data));
 		rv = decode_dmi((struct dmi_header *) dev->device_data, &data);
 		if (!rv)
 			try_init_dmi(&data);
-
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