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cdc-acm: fix NULL pointer reference

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commit 29c6dd591b upstream.

The union descriptor must be checked. Its usage was conditional
before the parser was introduced. This is important, because
many RNDIS device, which also use the common parser, have
bogus extra descriptors.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Tested-by: Vasily Galkin <galkin-vv@yandex.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oliver Neukum
2016-01-07 11:01:00 +01:00
committed by Greg Kroah-Hartman
parent f9a6b3cadd
commit ac1373d660
1 changed files with 7 additions and 1 deletions
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8
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)
info->u = header.usb_cdc_union_desc;
info->header = header.usb_cdc_header_desc;
info->ether = header.usb_cdc_ether_desc;
if (!info->u) {
if (rndis)
goto skip;
else /* in that case a quirk is mandatory */
goto bad_desc;
}
/* we need a master/control interface (what we're
* probed with) and a slave/data interface; union
* descriptors sort this all out.
@@ -256,7 +262,7 @@ skip:
goto bad_desc;
}
} else if (!info->header || !info->u || (!rndis && !info->ether)) {
} else if (!info->header || (!rndis && !info->ether)) {
dev_dbg(&intf->dev, "missing cdc %s%s%sdescriptor\n",
info->header ? "" : "header ",
info->u ? "" : "union ",