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Thu, 30 Apr 2026 00:52:26 -0700 (PDT) Date: Thu, 30 Apr 2026 10:52:23 +0300 From: Dan Carpenter To: Johannes Berg Cc: Kalle Valo , Raja Mani , Vasanthakumar Thiagarajan , Jouni Malinen , linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: Re: [PATCH] wifi: cfg80211: don't allow negative key_len values Message-ID: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Thu, Apr 30, 2026 at 09:05:35AM +0200, Johannes Berg wrote: > On Thu, 2026-04-30 at 09:15 +0300, Dan Carpenter wrote: > > 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. > > Clearly this commit doesn't seem problematic, but I'm not sure I see the > path to it mattering? The key_len should only ever be set by > wext/nl80211, and that can't really end up with a negative length? > > We should probably just make it a u8 there, no way it's ever bigger than > that, but I'm not seeing through why this would matter much right now. Ah. Yeah. You're right. :/ Sorry for the noise. regards, dan carpenter