linux-kernel - [19/68] drivers/net/cxgb3/cxgb3_main.c: prevent reading uninitialized stack memory

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Date:	Fri, 24 Sep 2010 09:31:43 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Dan Rosenberg <dan.j.rosenberg@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [19/68] drivers/net/cxgb3/cxgb3_main.c: prevent reading uninitialized stack memory

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Dan Rosenberg <drosenberg@...curity.com>

commit 49c37c0334a9b85d30ab3d6b5d1acb05ef2ef6de upstream.

Fixed formatting (tabs and line breaks).

The CHELSIO_GET_QSET_NUM device ioctl allows unprivileged users to read
4 bytes of uninitialized stack memory, because the "addr" member of the
ch_reg struct declared on the stack in cxgb_extension_ioctl() is not
altered or zeroed before being copied back to the user.  This patch
takes care of it.

Signed-off-by: Dan Rosenberg <dan.j.rosenberg@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/cxgb3/cxgb3_main.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/net/cxgb3/cxgb3_main.c
+++ b/drivers/net/cxgb3/cxgb3_main.c
@@ -2274,6 +2274,8 @@ static int cxgb_extension_ioctl(struct n
 	case CHELSIO_GET_QSET_NUM:{
 		struct ch_reg edata;

+		memset(&edata, 0, sizeof(struct ch_reg));
+
 		edata.cmd = CHELSIO_GET_QSET_NUM;
 		edata.val = pi->nqsets;
 		if (copy_to_user(useraddr, &edata, sizeof(edata)))

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