wifi: cw1200: cap SSID length in cw1200_do_join()

JIRA: https://issues.redhat.com/browse/RHEL-114889

commit f8f15f6
Author: Dan Carpenter <dan.carpenter@linaro.org>
Date:   Fri Aug 29 15:48:28 2025 +0300

    wifi: cw1200: cap SSID length in cw1200_do_join()
    
    If the ssidie[1] length is more that 32 it leads to memory corruption.
    
    Fixes: a910e4a ("cw1200: add driver for the ST-E CW1100 & CW1200 WLAN chipsets")
    Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
    Link: https://patch.msgid.link/e91fb43fcedc4893b604dfb973131661510901a7.1756456951.git.dan.carpenter@linaro.org
    Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Signed-off-by: Jose Ignacio Tornos Martinez <jtornosm@redhat.com>

Author: jtornosm

drivers/net/wireless/st/cw1200/sta.c

@@ -1291,7 +1291,7 @@ static void cw1200_do_join(struct cw1200_common *priv)
 		rcu_read_lock();
 		ssidie = ieee80211_bss_get_ie(bss, WLAN_EID_SSID);
 		if (ssidie) {
-			join.ssid_len = ssidie[1];
+			join.ssid_len = min(ssidie[1], IEEE80211_MAX_SSID_LEN);
 			memcpy(join.ssid, &ssidie[2], join.ssid_len);
 		}
 		rcu_read_unlock();