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([2401:4900:53f5:9794:b4e2:d5:4aa9:9038]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2a933978141sm23572205ad.84.2026.02.04.04.53.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Feb 2026 04:54:00 -0800 (PST) From: dhyaan19022009-hue X-Google-Original-From: dhyaan19022009-hue To: johannes@sipsolutions.net Cc: kvalo@kernel.org, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, dhyaan19022009-hue , Dhyan K Prajapati Subject: [PATCH] iwlwifi: dvm: fix NULL pointer dereference in rxon Date: Wed, 4 Feb 2026 18:23:45 +0530 Message-ID: <20260204125345.6072-1-dhyaan19022009@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When bringing up the wireless interface via virtual monitor mode, iwlagn_bss_info_changed() can be called with a vif that has no associated rxon context. This occurs during the ieee80211_add_virtual_monitor() -> ieee80211_do_open() sequence. The function iwl_rxon_ctx_from_vif() returns NULL for virtual monitor interfaces, causing a NULL pointer dereference when the code attempts to access ctx fields at offset +0x10. Crash signature: BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: 0010:iwlagn_bss_info_changed+0x19d/0x640 [iwldvm] Call Trace: drv_link_info_changed+0x2b5/0x2c0 [mac80211] ieee80211_link_info_change_notify+0x13d/0x160 [mac80211] ieee80211_recalc_txpower+0x5c/0x60 [mac80211] ieee80211_assign_link_chanctx+0x182/0x410 [mac80211] ieee80211_add_virtual_monitor+0x17c/0x2b0 [mac80211] ieee80211_do_open+0x6d8/0x740 [mac80211] Add an early NULL check for ctx before accessing its members. Hardware: Dell Latitude E6430 WiFi: Intel Centrino Advanced-N 6205 [8086:0085] Kernel: 6.18.7-061807-generic Reported-by: Johannes Berg Signed-off-by: Dhyan K Prajapati --- drivers/net/wireless/intel/iwlwifi/dvm/rxon.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/net/wireless/intel/iwlwifi/dvm/rxon.c b/drivers/net/wi= reless/intel/iwlwifi/dvm/rxon.c index e08e44cae..91dcf18b1 100644 --- a/drivers/net/wireless/intel/iwlwifi/dvm/rxon.c +++ b/drivers/net/wireless/intel/iwlwifi/dvm/rxon.c @@ -1392,6 +1392,11 @@ void iwlagn_bss_info_changed(struct ieee80211_hw *hw, =20 mutex_lock(&priv->mutex); =20 + + if (!ctx) { + mutex_unlock(&priv->mutex); + return; + } if (changes & BSS_CHANGED_IDLE && vif->cfg.idle) { /* * If we go idle, then clearly no "passive-no-rx" --=20 2.43.0