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Tue, 21 Apr 2026 16:20:46 -0700 (PDT) Received: from localhost ([2a00:79e0:2e7c:8:50be:3375:972d:9e1d]) by smtp.gmail.com with UTF8SMTPSA id 5a478bee46e88-2e539fa244csm20302766eec.2.2026.04.21.16.20.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 21 Apr 2026 16:20:46 -0700 (PDT) Date: Tue, 21 Apr 2026 16:20:44 -0700 From: Brian Norris To: Tristan Madani Cc: Johannes Berg , linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, Tristan Madani Subject: Re: [PATCH v3 6/6] wifi: mwifiex: fix OOB read from inflated TLV length in IBSS peer event Message-ID: References: <20260421134938.331334-1-tristmd@gmail.com> <20260421134938.331334-7-tristmd@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260421134938.331334-7-tristmd@gmail.com> Hi Tristan, On Tue, Apr 21, 2026 at 01:49:38PM +0000, Tristan Madani wrote: > 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); The above 4 line have excessive line breaks. You're not even close to 80 characters (the old-school line limit), let alone the more modern 100 limit that checkpatch uses. Just make this 2 unbroken lines: if (condition) evt_len = ...; Brian > } else { > mwifiex_dbg(priv->adapter, MSG, > "management frame tlv not found!\n"); > -- > 2.47.3 >