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mwifiex: printk() overflow with 32-byte SSIDs 

SSIDs aren't guaranteed to be 0-terminated. Let's cap the max length
when we print them out.

This can be easily noticed by connecting to a network with a 32-octet
SSID:

[ 3903.502925] mwifiex_pcie 0000:01:00.0: info: trying to associate to
'0123456789abcdef0123456789abcdef <uninitialized mem>' bssid
xx:xx:xx:xx:xx:xx

Fixes: 5e6e3a92b9 ("wireless: mwifiex: initial commit for Marvell mwifiex driver")
Signed-off-by: Brian Norris <briannorris@chromium.org>
Cc: <stable@vger.kernel.org>
Acked-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Brian Norris 2016-11-08 18:28:24 -08:00 committed by Kalle Valo
parent d3532ea6ce
commit fcd2042e8d
1 changed files with 7 additions and 6 deletions
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13
drivers/net/wireless/marvell/mwifiex/cfg80211.c
View File

@ -2222,8 +2222,9 @@ done:
is_scanning_required = 1;
} else {
mwifiex_dbg(priv->adapter, MSG,
"info: trying to associate to '%s' bssid %pM\n",
(char *)req_ssid.ssid, bss->bssid);
"info: trying to associate to '%.*s' bssid %pM\n",
req_ssid.ssid_len, (char *)req_ssid.ssid,
bss->bssid);
memcpy(&priv->cfg_bssid, bss->bssid, ETH_ALEN);
break;
}
@ -2283,8 +2284,8 @@ mwifiex_cfg80211_connect(struct wiphy *wiphy, struct net_device *dev,
}
mwifiex_dbg(adapter, INFO,
"info: Trying to associate to %s and bssid %pM\n",
(char *)sme->ssid, sme->bssid);
"info: Trying to associate to %.*s and bssid %pM\n",
(int)sme->ssid_len, (char *)sme->ssid, sme->bssid);
if (!mwifiex_stop_bg_scan(priv))
cfg80211_sched_scan_stopped_rtnl(priv->wdev.wiphy);
@ -2417,8 +2418,8 @@ mwifiex_cfg80211_join_ibss(struct wiphy *wiphy, struct net_device *dev,
}
mwifiex_dbg(priv->adapter, MSG,
"info: trying to join to %s and bssid %pM\n",
(char *)params->ssid, params->bssid);
"info: trying to join to %.*s and bssid %pM\n",
params->ssid_len, (char *)params->ssid, params->bssid);
mwifiex_set_ibss_params(priv, params);