6.1-stable review patch. If anyone has any objections, please let me know.
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From: Seungjin Bae eeodqql09@gmail.com
[ Upstream commit 5570ad1423ee60f6e972dadb63fb2e5f90a54cbe ]
In cdc_parse_cdc_header(), the check for the USB_CDC_MBIM_EXTENDED_TYPE descriptor was using 'break' upon detecting an invalid length.
This was incorrect because 'break' only exits the switch statement, causing the code to fall through to cnt++, thus incorrectly incrementing the count of parsed descriptors for a descriptor that was actually invalid and being discarded.
This patch changes 'break' to 'goto next_desc;' to ensure that the logic skips the counter increment and correctly proceeds to the next descriptor in the buffer. This maintains an accurate count of only the successfully parsed descriptors.
Fixes: e4c6fb7794982 ("usbnet: move the CDC parser into USB core") Signed-off-by: Seungjin Bae eeodqql09@gmail.com Link: https://lore.kernel.org/r/20250928185611.764589-1-eeodqql09@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/usb/core/message.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c index 1673e5d089263..9f65556dc3745 100644 --- a/drivers/usb/core/message.c +++ b/drivers/usb/core/message.c @@ -2386,7 +2386,7 @@ int cdc_parse_cdc_header(struct usb_cdc_parsed_header *hdr, break; case USB_CDC_MBIM_EXTENDED_TYPE: if (elength < sizeof(struct usb_cdc_mbim_extended_desc)) - break; + goto next_desc; hdr->usb_cdc_mbim_extended_desc = (struct usb_cdc_mbim_extended_desc *)buffer; break;