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Tue, 21 Apr 2026 16:19:57 -0700 (PDT) Received: from localhost ([2a00:79e0:2e7c:8:50be:3375:972d:9e1d]) by smtp.gmail.com with UTF8SMTPSA id 5a478bee46e88-2e53ccce460sm21565287eec.19.2026.04.21.16.19.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 21 Apr 2026 16:19:57 -0700 (PDT) Date: Tue, 21 Apr 2026 16:19:55 -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 1/6] wifi: mwifiex: fix OOB write from firmware queue_index in WMM status response Message-ID: References: <20260421134938.331334-1-tristmd@gmail.com> <20260421134938.331334-2-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: <20260421134938.331334-2-tristmd@gmail.com> Hi Tristan, I haven't gotten through all of these yet, but so far, they seem good aside from some cosmetic things. Comments inline. On Tue, Apr 21, 2026 at 01:49:33PM +0000, Tristan Madani wrote: > 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); > > + Checkpatch complains about these double blank lines. Remove one. > + if (tlv_wmm_qstatus->queue_index >= > + IEEE80211_NUM_ACS) { Unnecessary line break. You could also replace IEEE80211_NUM_ACS with ARRAY_SIZE(priv->wmm.ac_status) for clarity. > + break; > + } Might as well drop the braces, for a simple 1-liner conditional. Also, please add a blank line after. Thanks, Brian > ac_status = &priv->wmm.ac_status[tlv_wmm_qstatus-> > queue_index]; > ac_status->disabled = tlv_wmm_qstatus->disabled; > -- > 2.47.3 >