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From 29c6dd591bbd592472247441de9fa694acdabae8 Mon Sep 17 00:00:00 2001
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From: Oliver Neukum <oneukum@suse.com>
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Date: Thu, 7 Jan 2016 11:01:00 +0100
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Subject: [PATCH] cdc-acm: fix NULL pointer reference
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The union descriptor must be checked. Its usage was conditional
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before the parser was introduced. This is important, because
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many RNDIS device, which also use the common parser, have
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bogus extra descriptors.
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Signed-off-by: Oliver Neukum <oneukum@suse.com>
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Tested-by: Vasily Galkin <galkin-vv@yandex.ru>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/net/usb/cdc_ether.c | 8 +++++++-
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1 file changed, 7 insertions(+), 1 deletion(-)
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diff --git a/drivers/net/usb/cdc_ether.c b/drivers/net/usb/cdc_ether.c
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index 3da70bf..7cba2c3 100644
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--- a/drivers/net/usb/cdc_ether.c
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+++ b/drivers/net/usb/cdc_ether.c
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@@ -160,6 +160,12 @@ int usbnet_generic_cdc_bind(struct usbnet *dev, struct usb_interface *intf)
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info->u = header.usb_cdc_union_desc;
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info->header = header.usb_cdc_header_desc;
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info->ether = header.usb_cdc_ether_desc;
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+ if (!info->u) {
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+ if (rndis)
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+ goto skip;
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+ else /* in that case a quirk is mandatory */
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+ goto bad_desc;
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+ }
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/* we need a master/control interface (what we're
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* probed with) and a slave/data interface; union
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* descriptors sort this all out.
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@@ -256,7 +262,7 @@ skip:
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goto bad_desc;
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}
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- } else if (!info->header || !info->u || (!rndis && !info->ether)) {
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+ } else if (!info->header || (!rndis && !info->ether)) {
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dev_dbg(&intf->dev, "missing cdc %s%s%sdescriptor\n",
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info->header ? "" : "header ",
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info->u ? "" : "union ",
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--
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2.5.0
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