On Thu, 2016-11-17 at 17:11 +0100, Wim Osterholt wrote: > Nov 17 15:07:51 localhost kernel: Check point 10 > Nov 17 15:07:51 localhost kernel: BUG: unable to handle kernel NULL pointer dereference at 00000249 > Nov 17 15:07:51 localhost kernel: IP: [<e186ece2>] acm_probe+0x559/0xe53 [cdc_acm] > Nov 17 15:07:51 localhost kernel: *pde = 00000000 > Nov 17 15:07:51 localhost kernel: Oops: 0000 [#1] SMP I don't understand it, bit please test the attached patch with dynamic debugging for cdc-acm and the kernel log level at maximum. And please repost "lsusb -v" for your device. Regards Oliver
From 51665f8ce6e13ba11b93b856290135bfe529d835 Mon Sep 17 00:00:00 2001 From: Oliver Neukum <oneukum@xxxxxxxx> Date: Mon, 21 Nov 2016 14:08:31 +0100 Subject: [PATCH] CDC-ACM: debugging for parsed descriptors This is necessary to debug the parser on malformed headers. Signed-off-by: Oliver Neukum <oneukum@xxxxxxxx> --- drivers/usb/class/cdc-acm.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 6895f9e..f03b5db 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1188,6 +1188,12 @@ static int acm_probe(struct usb_interface *intf, cdc_parse_cdc_header(&h, intf, buffer, buflen); union_header = h.usb_cdc_union_desc; + + dev_dbg(&intf->dev, "Parsed device header\n"); + dev_dbg(&intf->dev, "Union descriptor %p\n", h.usb_cdc_union_desc); + dev_dbg(&intf->dev, "ACM descriptor %p\n", h.usb_cdc_acm_descriptor); + dev_dbg(&intf->dev, "Country descriptor %p\n", h.usb_cdc_country_functional_desc); + cmgmd = h.usb_cdc_call_mgmt_descriptor; if (cmgmd) call_intf_num = cmgmd->bDataInterface; -- 2.1.4
