From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C85112D94A7; Thu, 15 Jan 2026 17:15:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768497315; cv=none; b=iax5q5KUEfYSvcWSbXDkebRxAPdFe7m97GYbv3DV81wUvK9Jw5XNdU/kG4cmineFogO7FA7WxhVKkv3EW7h8vGrdVfSYGIp34ihruP24/OAvkKq7nQtAztSZPJKy5cqJVnrpRlYllqp7HNjrbvJq5Gb4wPPRMPSv8uo4XZ3CRzA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768497315; c=relaxed/simple; bh=U7u1TUh0OHomWijcF4ztdVl9skDRxy/26AolChJj8Ls=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=bvKzBG9BZKzWhX83pKH1niF0mKO+5fwvRUP9BRgh+GCGAj371SNjjHYSf0m81smXpjmK9PnqOoTdW5yi95hVMpG6wR2xmlIfLMWq3CR6YGaqz9X5Oh5Z+hdZPaG6d/1N2c8pZHJYiU/7ucKGZrXe5HtneQSncm8OU7YVypdt84U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=D+6YgUlS; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="D+6YgUlS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4FD66C116D0; Thu, 15 Jan 2026 17:15:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1768497315; bh=U7u1TUh0OHomWijcF4ztdVl9skDRxy/26AolChJj8Ls=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=D+6YgUlS23UROizlElO2v7HHFcLhh20LGajY5wAr+P23lnGjXRL/w9r72Hqa+3KuS r22f4bdg1kJV0LckV4bUus6lGLEsGtBiUzlGH64QKrvN/iJdgJxKsmXkqnDI4cz5tr BOtDjGmsDs0CVyJsuKybXNn89p5Bk/OBNTLWfkWk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Seungjin Bae , Sasha Levin Subject: [PATCH 5.15 039/554] USB: Fix descriptor count when handling invalid MBIM extended descriptor Date: Thu, 15 Jan 2026 17:41:45 +0100 Message-ID: <20260115164247.655029150@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260115164246.225995385@linuxfoundation.org> References: <20260115164246.225995385@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Seungjin Bae [ 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 Link: https://lore.kernel.org/r/20250928185611.764589-1-eeodqql09@gmail.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- 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; -- 2.51.0