linux-kernel - [PATCH v3] drivers/net/tulip/de4x5.c: fix union member name in DE4X5_GET

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Message-ID: <1284699944.2565.4.camel@dan>
Date:	Fri, 17 Sep 2010 01:05:44 -0400
From:	Dan Rosenberg <drosenberg@...curity.com>
To:	David Miller <davem@...emloft.net>
Cc:	grundler@...isc-linux.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, kyle@...artin.ca, jeffm@...e.com,
	security@...nel.org
Subject: [PATCH v3] drivers/net/tulip/de4x5.c: fix union member name in
 DE4X5_GET_REG ioctl

Now with descriptive title, as requested.

This was previously reported as a security issue due to leakage of
uninitialized stack memory.  Jeff Mahoney pointed out that this is
incorrect since the copied data is from a union (rather than a struct).
Therefore, this patch is only under consideration for the sake of
correctness, and is not security relevant. 

Signed-off-by: Dan Rosenberg <dan.j.rosenberg@...il.com>
Acked-by: Grant Grundler <grundler@...isc-linux.org>

--- linux-2.6.35.4.orig/drivers/net/tulip/de4x5.c       2010-08-26 19:47:12.000000000 -0400
+++ linux-2.6.35.4/drivers/net/tulip/de4x5.c    2010-09-14 21:26:52.499474207 -0400
@@ -5474,7 +5474,7 @@ de4x5_ioctl(struct net_device *dev, stru
        tmp.lval[6] = inl(DE4X5_STRR); j+=4;
        tmp.lval[7] = inl(DE4X5_SIGR); j+=4;
        ioc->len = j;
-       if (copy_to_user(ioc->data, tmp.addr, ioc->len)) return -EFAULT;
+       if (copy_to_user(ioc->data, tmp.lval, ioc->len)) return -EFAULT;
        break;
 
 #define DE4X5_DUMP              0x0f /* Dump the DE4X5 Status */






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