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([2001:41d0:303:db6b::]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488fb78becdsm176331185e9.5.2026.04.21.06.49.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Apr 2026 06:49:46 -0700 (PDT) From: Tristan Madani To: Brian Norris Cc: Johannes Berg , linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, Tristan Madani Subject: [PATCH v3 6/6] wifi: mwifiex: fix OOB read from inflated TLV length in IBSS peer event Date: Tue, 21 Apr 2026 13:49:38 +0000 Message-ID: <20260421134938.331334-7-tristmd@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260421134938.331334-1-tristmd@gmail.com> References: <20260421134938.331334-1-tristmd@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Tristan Madani The IBSS connected handler replaces the buffer-bounded evt_len with the firmware-controlled TLV header length. An inflated value drives the IE parsing loop past the event buffer into adjacent kernel heap memory. Cap the TLV-derived length at the remaining event data size. Fixes: 432da7d243da ("mwifiex: add HT aggregation support for adhoc mode") Signed-off-by: Tristan Madani --- Changes in v3: - Regenerated from wireless-next with proper git format-patch to produce valid index hashes (v2 had post-processed index lines). Changes in v2: - No code changes from v1. drivers/net/wireless/marvell/mwifiex/sta_event.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/wireless/marvell/mwifiex/sta_event.c b/drivers/net/wireless/marvell/mwifiex/sta_event.c index 6b7e5b6a66a9e..62a879c09106e 100644 --- a/drivers/net/wireless/marvell/mwifiex/sta_event.c +++ b/drivers/net/wireless/marvell/mwifiex/sta_event.c @@ -45,6 +45,10 @@ static int mwifiex_check_ibss_peer_capabilities(struct mwifiex_private *priv, */ evt_len = le16_to_cpu(tlv_mgmt_frame->header.len); curr += (sizeof(*tlv_mgmt_frame) + 12); + if (evt_len > event->len - + (curr - event->data)) + evt_len = event->len - + (curr - event->data); } else { mwifiex_dbg(priv->adapter, MSG, "management frame tlv not found!\n"); -- 2.47.3