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([2001:41d0:303:db6b::]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488fb78becdsm176331185e9.5.2026.04.21.06.49.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Apr 2026 06:49:42 -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 3/6] wifi: mwifiex: fix OOB read from firmware sta_count in station list response Date: Tue, 21 Apr 2026 13:49:35 +0000 Message-ID: <20260421134938.331334-4-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 sta_count (u16) is used as an unbounded loop counter for iterating station info entries. An inflated count drives reads past the response buffer into kernel heap memory. Add a check that sta_count fits within the response size. Fixes: b21783e94e20 ("mwifiex: add sta_list firmware command") 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_cmdresp.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c b/drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c index 85512f526c5f2..4cf654046c6ae 100644 --- a/drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c +++ b/drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c @@ -976,8 +976,16 @@ static int mwifiex_ret_uap_sta_list(struct mwifiex_private *priv, struct mwifiex_ie_types_sta_info *sta_info = (void *)&sta_list->tlv; int i; struct mwifiex_sta_node *sta_node; + u16 resp_size = le16_to_cpu(resp->size); + u16 count = le16_to_cpu(sta_list->sta_count); + u16 max_count; - for (i = 0; i < (le16_to_cpu(sta_list->sta_count)); i++) { + if (resp_size < sizeof(*resp) - sizeof(resp->params) + sizeof(*sta_list)) + return -EINVAL; + max_count = (resp_size - sizeof(*resp) + sizeof(resp->params) - + sizeof(*sta_list)) / sizeof(*sta_info); + count = min(count, max_count); + for (i = 0; i < count; i++) { sta_node = mwifiex_get_sta_entry(priv, sta_info->mac); if (unlikely(!sta_node)) continue; -- 2.47.3