[PATCH] staging: wfx: check ssidlen and prevent an array overflow

Dan Carpenter
2020-04-24T10:44:52Z

We need to cap "ssidlen" to prevent a memcpy() overflow.

Fixes: 40115bbc40e2 ("staging: wfx: implement the rest of mac80211 API")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
drivers/staging/wfx/sta.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/wfx/sta.c b/drivers/staging/wfx/sta.c
index c73dbb3a0de8c..3bff0f1e3d9ba 100644
--- a/drivers/staging/wfx/sta.c
+++ b/drivers/staging/wfx/sta.c
@@ -479,7 +479,9 @@ static void wfx_do_join(struct wfx_vif *wvif)
ssidie = ieee80211_bss_get_ie(bss, WLAN_EID_SSID);
if (ssidie) {
ssidlen = ssidie[1];
- memcpy(ssid, &ssidie[2], ssidie[1]);
+ if (ssidlen > IEEE80211_MAX_SSID_LEN)
+ ssidlen = IEEE80211_MAX_SSID_LEN;
+ memcpy(ssid, &ssidie[2], ssidlen);
}
rcu_read_unlock();

--
2.26.1