linux-kernel - [PATCH 3.2 85/87] staging: wlags49_h2: buffer overflow setting station name

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Message-ID: <lsq.1385387069.589329362@decadent.org.uk>
Date:	Mon, 25 Nov 2013 13:44:29 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Dan Carpenter" <dan.carpenter@...cle.com>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Fabian Yamaguchi" <fabs@...sec.de>, "Nico Golde" <nico@...lde.de>
Subject: [PATCH 3.2 85/87] staging: wlags49_h2: buffer overflow setting
 station name

3.2.53-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Dan Carpenter <dan.carpenter@...cle.com>

commit b5e2f339865fb443107e5b10603e53bbc92dc054 upstream.

We need to check the length parameter before doing the memcpy().  I've
actually changed it to strlcpy() as well so that it's NUL terminated.

You need CAP_NET_ADMIN to trigger these so it's not the end of the
world.

Reported-by: Nico Golde <nico@...lde.de>
Reported-by: Fabian Yamaguchi <fabs@...sec.de>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/staging/wlags49_h2/wl_priv.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- a/drivers/staging/wlags49_h2/wl_priv.c
+++ b/drivers/staging/wlags49_h2/wl_priv.c
@@ -570,6 +570,7 @@ int wvlan_uil_put_info( struct uilreq *u
 	ltv_t                   *pLtv;
 	bool_t                  ltvAllocated = FALSE;
 	ENCSTRCT                sEncryption;
+	size_t			len;
 
 #ifdef USE_WDS
 	hcf_16                  hcfPort  = HCF_PORT_0;
@@ -686,7 +687,8 @@ int wvlan_uil_put_info( struct uilreq *u
 					break;
 				case CFG_CNF_OWN_NAME:
 					memset( lp->StationName, 0, sizeof( lp->StationName ));
-					memcpy( (void *)lp->StationName, (void *)&pLtv->u.u8[2], (size_t)pLtv->u.u16[0]);
+					len = min_t(size_t, pLtv->u.u16[0], sizeof(lp->StationName));
+					strlcpy(lp->StationName, &pLtv->u.u8[2], len);
 					pLtv->u.u16[0] = CNV_INT_TO_LITTLE( pLtv->u.u16[0] );
 					break;
 				case CFG_CNF_LOAD_BALANCING:
@@ -1800,6 +1802,7 @@ int wvlan_set_station_nickname(struct ne
 {
         struct wl_private *lp = wl_priv(dev);
         unsigned long flags;
+	size_t len;
         int         ret = 0;
 	/*------------------------------------------------------------------------*/
 
@@ -1810,8 +1813,8 @@ int wvlan_set_station_nickname(struct ne
         wl_lock(lp, &flags);
 
         memset( lp->StationName, 0, sizeof( lp->StationName ));
-
-        memcpy( lp->StationName, extra, wrqu->data.length);
+	len = min_t(size_t, wrqu->data.length, sizeof(lp->StationName));
+	strlcpy(lp->StationName, extra, len);
 
         /* Commit the adapter parameters */
         wl_apply( lp );

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