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([2001:41d0:303:db6b::]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488fb78becdsm176331185e9.5.2026.04.21.06.49.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Apr 2026 06:49:41 -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 1/6] wifi: mwifiex: fix OOB write from firmware queue_index in WMM status response Date: Tue, 21 Apr 2026 13:49:33 +0000 Message-ID: <20260421134938.331334-2-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 firmware-controlled queue_index (u8) from the WMM queue status TLV is used to index the 4-entry ac_status[] array without validation. An out-of-range value causes out-of-bounds writes of three firmware- controlled bytes into adjacent struct fields. Add a bounds check before using queue_index as an array index. Fixes: 5e6e3a92b9a4 ("wireless: mwifiex: initial commit for Marvell mwifiex driver") 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/wmm.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/net/wireless/marvell/mwifiex/wmm.c b/drivers/net/wireless/marvell/mwifiex/wmm.c index 841505e83c7fd..27e6dedcca2e8 100644 --- a/drivers/net/wireless/marvell/mwifiex/wmm.c +++ b/drivers/net/wireless/marvell/mwifiex/wmm.c @@ -943,6 +943,11 @@ int mwifiex_ret_wmm_get_status(struct mwifiex_private *priv, tlv_wmm_qstatus->flow_required, tlv_wmm_qstatus->disabled); + + if (tlv_wmm_qstatus->queue_index >= + IEEE80211_NUM_ACS) { + break; + } ac_status = &priv->wmm.ac_status[tlv_wmm_qstatus-> queue_index]; ac_status->disabled = tlv_wmm_qstatus->disabled; -- 2.47.3