4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Johan Hovold <johan@xxxxxxxxxx>
commit 03ace948a4eb89d1cf51c06afdfc41ebca5fdb27 upstream.
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: df3654236e31 ("wusb: add the Wire Adapter (WA) core")
Cc: Inaky Perez-Gonzalez <inaky.perez-gonzalez@xxxxxxxxx>
Cc: David Vrabel <david.vrabel@xxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/wusbcore/wa-hc.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/usb/wusbcore/wa-hc.c
+++ b/drivers/usb/wusbcore/wa-hc.c
@@ -39,6 +39,9 @@ int wa_create(struct wahc *wa, struct us
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;