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authorJohan Hovold <johan@kernel.org>2017-03-13 15:42:03 +0300
committerDavid S. Miller <davem@davemloft.net>2017-03-13 22:28:40 +0300
commit6e526fdff7be4f13b24f929a04c0e9ae6761291e (patch)
tree5c1adb8fb7580b551628871a0d08b32b16ad613c
parent68c32f9c2a36d410aa242e661506e5b2c2764179 (diff)
downloadlinux-6e526fdff7be4f13b24f929a04c0e9ae6761291e.tar.xz
net: wimax/i2400m: fix NULL-deref at probe
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. The endpoints are specifically dereferenced in the i2400m_bootrom_init path during probe (e.g. in i2400mu_tx_bulk_out). Fixes: f398e4240fce ("i2400m/USB: probe/disconnect, dev init/shutdown and reset backends") Cc: Inaky Perez-Gonzalez <inaky@linux.intel.com> Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/wimax/i2400m/usb.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/wimax/i2400m/usb.c b/drivers/net/wimax/i2400m/usb.c
index e7f5910a6519..f8eb66ef2944 100644
--- a/drivers/net/wimax/i2400m/usb.c
+++ b/drivers/net/wimax/i2400m/usb.c
@@ -467,6 +467,9 @@ int i2400mu_probe(struct usb_interface *iface,
struct i2400mu *i2400mu;
struct usb_device *usb_dev = interface_to_usbdev(iface);
+ if (iface->cur_altsetting->desc.bNumEndpoints < 4)
+ return -ENODEV;
+
if (usb_dev->speed != USB_SPEED_HIGH)
dev_err(dev, "device not connected as high speed\n");