From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
[ Upstream commit 87f86cddda65cab8a7e3df8a00e16abeccaa0730 ]
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@xxxxxxxxxx>
Reviewed-by: Jérôme Pouiller <jerome.pouiller@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20200424104235.GA416402@mwanda
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 9d430346a58b..969d7a4a7fbd 100644
--- a/drivers/staging/wfx/sta.c
+++ b/drivers/staging/wfx/sta.c
@@ -520,7 +520,9 @@ 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();
--
2.25.1
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