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Mon, 07 Sep 2026 21:08:19 -0700 (PDT) Received: from MacBook-Pro.wireless-1x.unc.edu ([152.23.158.64]) by smtp.gmail.com with ESMTPSA id af79cd13be357-9397fb566a8sm1055026785a.25.2026.09.07.21.08.19 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Mon, 07 Sep 2026 21:08:19 -0700 (PDT) From: Juan Perdomo To: mchehab@kernel.org Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+ddccc0c0dbc0a38ffccb@syzkaller.appspotmail.com Subject: [PATCH] media: cx231xx: preserve I2C transfer length Date: Tue, 8 Sep 2026 00:07:34 -0400 Message-ID: <20260908040734.1175-1-jcperdomo100@gmail.com> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The I2C core stores message lengths in u16, but cx231xx truncates them to u8 when populating cx231xx_i2c_xfer_data. A 0x700-byte read therefore becomes a zero-length request. USB treats zero-length control transfers as OUT regardless of bRequestType, so the IN control pipe trips the usb_submit_urb() direction warning. Use u16 for buf_size, matching both i2c_msg.len and VENDOR_REQUEST_IN.wLength. Oversized transfers then reach the existing URB_MAX_CTRL_SIZE check and return -EINVAL. Fixes: e0d3bafd0258 ("V4L/DVB (10954): Add cx231xx USB driver") Reported-by: syzbot+ddccc0c0dbc0a38ffccb@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=ddccc0c0dbc0a38ffccb Tested-by: syzbot+ddccc0c0dbc0a38ffccb@syzkaller.appspotmail.com Signed-off-by: Juan Perdomo --- Testing: - Syzbot reproduced the original USB direction warning on unpatched df290809 (Linux 7.3-rc2). https://syzkaller.appspot.com/x/report.txt?x=1107e749580000 - Built the complete cx231xx linked object on ARM64 with GCC 11.4.0, CONFIG_VIDEO_CX231XX=m and W=1. - Syzbot tested the patch on df290809 (Linux 7.3-rc2) with Clang 22.1.8; the supplied reproducer did not trigger an issue. https://syzkaller.appspot.com/x/log.txt?x=1123f105580000 No physical-device testing was performed. drivers/media/usb/cx231xx/cx231xx.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/usb/cx231xx/cx231xx.h b/drivers/media/usb/cx231xx/cx231xx.h index 19f5036a7..f85d054fb 100644 --- a/drivers/media/usb/cx231xx/cx231xx.h +++ b/drivers/media/usb/cx231xx/cx231xx.h @@ -463,7 +463,7 @@ struct cx231xx_i2c_xfer_data { u8 direction; /* 1 - IN, 0 - OUT */ u8 saddr_len; /* sub address len */ u16 saddr_dat; /* sub addr data */ - u8 buf_size; /* buffer size */ + u16 buf_size; /* buffer size */ u8 *p_buffer; /* pointer to the buffer */ }; base-commit: df2908090cda368b01ff43709f51890076c56157 -- 2.50.1 (Apple Git-155)