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([2001:41d0:303:db6b::]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488f5813954sm1896615e9.3.2026.04.15.15.24.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Apr 2026 15:24:28 -0700 (PDT) From: Tristan Madani To: Johannes Berg Cc: linux-wireless@vger.kernel.org, b43-dev@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/2] wifi: b43: fix OOB read from hardware key index in b43_rx() Date: Wed, 15 Apr 2026 22:24:25 +0000 Message-ID: <20260415222425.1544638-3-tristmd@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260415222425.1544638-1-tristmd@gmail.com> References: <20260415222425.1544638-1-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 key index in b43_rx() can exceed the dev->key[] array size (58 entries). The existing B43_WARN_ON is non-enforcing in production builds, allowing an out-of-bounds read of 1 byte from struct b43_firmware. A non-zero OOB value causes RX_FLAG_DECRYPTED to be incorrectly set on un-decrypted frames. Replace with an enforcing check that skips the key lookup for invalid indices. Fixes: e4d6b7951812 ("[B43]: add mac80211-based driver for modern BCM43xx devices") Signed-off-by: Tristan Madani --- drivers/net/wireless/broadcom/b43/xmit.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/broadcom/b43/xmit.c b/drivers/net/wireless/broadcom/b43/xmit.c index XXXXXXX..XXXXXXX 100644 --- a/drivers/net/wireless/broadcom/b43/xmit.c +++ b/drivers/net/wireless/broadcom/b43/xmit.c @@ -704,7 +704,10 @@ void b43_rx(struct b43_wldev *dev, struct sk_buff *skb, const void *_rxhdr) */ keyidx = b43_kidx_to_raw(dev, keyidx); - B43_WARN_ON(keyidx >= ARRAY_SIZE(dev->key)); + if (keyidx >= ARRAY_SIZE(dev->key)) { + b43dbg(dev->wl, "RX: invalid key index %u\n", keyidx); + goto drop; + } if (dev->key[keyidx].algorithm != B43_SEC_ALGO_NONE) { wlhdr_len = ieee80211_hdrlen(fctl);