| From | Jiri Slaby <> | Subject | [PATCH 3.12 090/142] uwb: hwa-rc: fix NULL-deref at probe | Date | Mon, 10 Apr 2017 17:32:51 +0200 |
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From: Johan Hovold <johan@kernel.org>
3.12-stable review patch. If anyone has any objections, please let me know.
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commit daf229b15907fbfdb6ee183aac8ca428cb57e361 upstream.
Make sure to check the number of endpoints to avoid dereferencing a NULL-pointer should a malicious device lack endpoints.
Note that the dereference happens in the start callback which is called during probe.
Fixes: de520b8bd552 ("uwb: add HWA radio controller driver") Cc: Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> Cc: David Vrabel <david.vrabel@csr.com> Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Jiri Slaby <jslaby@suse.cz> --- drivers/uwb/hwa-rc.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/uwb/hwa-rc.c b/drivers/uwb/hwa-rc.c index 0257f35cfb9d..e75bbe5a10cd 100644 --- a/drivers/uwb/hwa-rc.c +++ b/drivers/uwb/hwa-rc.c @@ -825,6 +825,9 @@ static int hwarc_probe(struct usb_interface *iface, struct hwarc *hwarc; struct device *dev = &iface->dev; + if (iface->cur_altsetting->desc.bNumEndpoints < 1) + return -ENODEV; + result = -ENOMEM; uwb_rc = uwb_rc_alloc(); if (uwb_rc == NULL) { -- 2.12.2
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