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([2401:4900:53f5:8722:5847:8ba8:5649:5c92]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-354b1e3ca08sm96940a91.4.2026.02.05.09.47.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Feb 2026 09:47:02 -0800 (PST) From: Dhyan K Prajapati X-Google-Original-From: Dhyan K Prajapati To: Johannes Berg Cc: linux-wireless@vger.kernel.org, netdev@vger.kernel.org, stable@vger.kernel.org, dhyaan19022009-hue Subject: [PATCH v5 wireless] mac80211: fix NULL pointer dereference in monitor mode Date: Thu, 5 Feb 2026 23:16:50 +0530 Message-ID: <20260205174650.4575-1-dhyaan19022009@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: dhyaan19022009-hue Crash trace: RIP: iwlagn_bss_info_changed+0x19d/0x640 [iwldvm] Code: 49 8b 46 10 <8b> 10 RAX: 0000000000000000 (NULL link->conf->bss) wifi: mac80211: fix NULL pointer deref regression in link notify Commit c57e5b974514 ("wifi: mac80211: fix WARN_ON for monitor mode on some devices") reorganized link change notifications. This caused a regression for hardware using IEEE80211_HW_WANT_MONITOR_VIF. In monitor mode, link->conf->bss is uninitialized, but current logic allows these notifications to reach driver callbacks, causing a deterministic NULL dereference in drivers like iwldvm. Fix this by validating the BSS context before driver notification. Device: Intel Centrino Advanced-n 6205 Fixes: c57e5b974514 ("wifi: mac80211: fix WARN_ON for monitor mode on some devices") Cc: stable@vger.kernel.org Cc: netdev@vger.kernel.org Cc: linux-wireless@vger.kernel.org Cc: Johannes Berg Signed-off-by: Dhyan K Prajapati --- net/mac80211/main.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/mac80211/main.c b/net/mac80211/main.c index b05e313c7..190222c26 100644 --- a/net/mac80211/main.c +++ b/net/mac80211/main.c @@ -416,6 +416,8 @@ void ieee80211_link_info_change_notify(struct ieee80211_sub_if_data *sdata, case NL80211_IFTYPE_MONITOR: if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) return; + if (!link->conf->bss) + return; break; default: break; -- 2.43.0