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([2001:41d0:303:db6b::]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4abf67aa704sm255490595e9.8.2026.11.02.04.23.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Nov 2026 04:23:20 -0800 (PST) From: Tristan Madani To: linux-wireless@vger.kernel.org Cc: arend.vanspriel@broadcom.com, brcm80211@lists.linux.dev, brcm80211-dev-list.pdl@broadcom.com, fariyaf@gmail.com, linville@tuxdriver.com, kvalo@kernel.org, linux-kernel@vger.kernel.org, Tristan Madani , stable@vger.kernel.org Subject: [PATCH wireless 2/2] wifi: rsi: zero-pad SDIO TX to block boundary Date: Mon, 2 Nov 2026 12:23:11 +0000 Message-ID: <20261102122311.181075-3-tristmd@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20261102122311.181075-1-tristmd@gmail.com> References: <20261102122311.181075-1-tristmd@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Tristan Madani rsi_sdio_host_intf_write_pkt() rounds the packet length up to the SDIO block size and passes the larger length to rsi_sdio_write_register_multiple(). When the packet is not block-aligned, the SDIO controller reads past the original data into adjacent heap memory, leaking stale kernel data to the wireless device. Zero-fill the padding before the SDIO write. Fixes: dad0d04fa7ba ("rsi: Add RS9113 wireless driver") Cc: stable@vger.kernel.org Signed-off-by: Tristan Madani --- drivers/net/wireless/rsi/rsi_91x_sdio.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/wireless/rsi/rsi_91x_sdio.c b/drivers/net/wireless/rsi/rsi_91x_sdio.c index bfa386b820d89..8bfb08306d03c 100644 --- a/drivers/net/wireless/rsi/rsi_91x_sdio.c +++ b/drivers/net/wireless/rsi/rsi_91x_sdio.c @@ -772,6 +772,9 @@ static int rsi_sdio_host_intf_write_pkt(struct rsi_hw *adapter, address = (num_blocks * block_size | (queueno << 12)); length = num_blocks * block_size; + if (length > len) + memset((u8 *)pkt + len, 0, length - len); + status = rsi_sdio_write_register_multiple(adapter, address, (u8 *)pkt, -- 2.47.3