linux-kernel - [PATCH 2/3] wifi: libertas: cap SSID len in lbs

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Message-ID: <2a40f5ec7617144aef412034c12919a4927d90ad.1756456951.git.dan.carpenter@linaro.org>
Date: Fri, 29 Aug 2025 15:48:35 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Solomon Peachy <pizza@...ftnet.org>
Cc: Johannes Berg <johannes.berg@...el.com>, Felix Fietkau <nbd@....name>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, libertas-dev@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] wifi: libertas: cap SSID len in lbs_associate()

If the ssid_eid[1] length is more that 32 it leads to memory corruption.

Fixes: a910e4a94f69 ("cw1200: add driver for the ST-E CW1100 & CW1200 WLAN chipsets")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/net/wireless/marvell/libertas/cfg.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/marvell/libertas/cfg.c b/drivers/net/wireless/marvell/libertas/cfg.c
index 94dd488becaf..caba7491cd5a 100644
--- a/drivers/net/wireless/marvell/libertas/cfg.c
+++ b/drivers/net/wireless/marvell/libertas/cfg.c
@@ -1151,10 +1151,13 @@ static int lbs_associate(struct lbs_private *priv,
 	/* add SSID TLV */
 	rcu_read_lock();
 	ssid_eid = ieee80211_bss_get_ie(bss, WLAN_EID_SSID);
-	if (ssid_eid)
-		pos += lbs_add_ssid_tlv(pos, ssid_eid + 2, ssid_eid[1]);
-	else
+	if (ssid_eid) {
+		u32 ssid_len = min(ssid_eid[1], IEEE80211_MAX_SSID_LEN);
+
+		pos += lbs_add_ssid_tlv(pos, ssid_eid + 2, ssid_len);
+	} else {
 		lbs_deb_assoc("no SSID\n");
+	}
 	rcu_read_unlock();
 
 	/* add DS param TLV */
-- 
2.47.2