[PATCH 3.4 34/44] staging: wlags49_h2: buffer overflow setting station name

Greg Kroah-Hartman
2014-07-08T00:09:10Z

From: Dan Carpenter <dan.carpenter@oracle.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@ngolde.de>
Reported-by: Fabian Yamaguchi <fabs@goesec.de>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
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 );