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USB: wusbcore: fix NULL-deref at probe

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Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer or accessing memory beyond the endpoint array should a
malicious device lack the expected endpoints.

This specifically fixes the NULL-pointer dereference when probing HWA HC
devices.

Fixes: df3654236e ("wusb: add the Wire Adapter (WA) core")
Cc: stable <stable@vger.kernel.org>     # 2.6.28
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2017-03-13 13:47:51 +01:00 committed by Greg Kroah-Hartman
parent f259ca3eed
commit 03ace948a4
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/wusbcore/wa-hc.c
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@ -39,6 +39,9 @@ int wa_create(struct wahc *wa, struct usb_interface *iface,
int result;
struct device *dev = &iface->dev;
if (iface->cur_altsetting->desc.bNumEndpoints < 3)
return -ENODEV;
result = wa_rpipes_create(wa);
if (result < 0)
goto error_rpipes_create;