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([2001:41d0:303:db6b::]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a1e19ad17esm42257355e9.3.2026.10.18.15.54.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 18 Oct 2026 15:54:38 -0700 (PDT) From: Tristan Madani To: Mauro Carvalho Chehab , Hans Verkuil Cc: linux-media@vger.kernel.org, stable@vger.kernel.org, Tristan Madani Subject: [PATCH 0/3] media: USB: validate transfer lengths in URB callbacks Date: Sun, 18 Oct 2026 22:54:34 +0000 Message-ID: <20261018225437.2655311-1-tristmd@gmail.com> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Tristan Madani Several media USB drivers process URB transfer buffers at fixed offsets without checking actual_length or iso_frame_desc actual_length. When a device delivers a short transfer, the arithmetic on the length value wraps and the driver reads or copies from an unintended memory offset. This series adds minimum length checks to three drivers: - cx231xx video: isoc and bulk handlers need buffer_size >= 4 before computing p_buffer + buffer_size - 4 - cx231xx VBI: same pattern, raise threshold from > 0 to >= 4 - au0828: isoc handler subtracts 4-byte header, raise threshold from > 0 to >= 5 Tristan Madani (3): media: cx231xx: validate minimum transfer length in video handlers media: cx231xx: require minimum VBI transfer length media: au0828: require minimum isochronous packet length drivers/media/usb/au0828/au0828-video.c | 2 +- drivers/media/usb/cx231xx/cx231xx-vbi.c | 2 +- drivers/media/usb/cx231xx/cx231xx-video.c | 6 ++++++ 3 files changed, 8 insertions(+), 2 deletions(-) -- 2.39.5