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Wed, 29 Apr 2026 23:15:52 -0700 (PDT) Received: from localhost ([196.207.164.177]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48a81ed6bafsm68748675e9.2.2026.04.29.23.15.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Apr 2026 23:15:51 -0700 (PDT) Date: Thu, 30 Apr 2026 09:15:48 +0300 From: Dan Carpenter To: Kalle Valo Cc: Johannes Berg , Raja Mani , Vasanthakumar Thiagarajan , Jouni Malinen , linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH] wifi: cfg80211: don't allow negative key_len values Message-ID: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline X-Mailer: git-send-email haha only kidding Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The ath6kl_cfg80211_add_key() function has an upper bounds check on params->key_len which ensures that it can't go over WLAN_MAX_KEY_LEN but it doesn't check for negatives. This could potentially lead to memory corruption. Put a bounds check on negative values in cfg80211_validate_key_settings() to prevent this sort of bug in the future. Fixes: bdcd81707973 ("Add ath6kl cleaned up driver") Cc: stable@vger.kernel.org Signed-off-by: Dan Carpenter --- This is from static analysis. I can't think why a driver would ever want a negative length and I think this is the safest solution. But I have not tested it. net/wireless/util.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/wireless/util.c b/net/wireless/util.c index b78530c3e3f8..4552229eb2d2 100644 --- a/net/wireless/util.c +++ b/net/wireless/util.c @@ -397,6 +397,8 @@ int cfg80211_validate_key_settings(struct cfg80211_regi= stered_device *rdev, * or not the driver supports this algorithm, * of course. */ + if (params->key_len < 0) + return -EINVAL; break; } =20 --=20 2.53.0