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USB: idmouse: fix NULL-deref at probe

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commit b0addd3fa6bcd119be9428996d5d4522479ab240 upstream.

Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer should a malicious device lack endpoints.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Johan Hovold
2017-03-13 13:47:48 +01:00
committed by Willy Tarreau
parent 79e603e9ee
commit 712c7fb1ae
1 changed files with 3 additions and 0 deletions
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drivers/usb/misc/idmouse.c
+3
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@@ -347,6 +347,9 @@ static int idmouse_probe(struct usb_interface *interface,
if (iface_desc->desc.bInterfaceClass != 0x0A)
return -ENODEV;
if (iface_desc->desc.bNumEndpoints < 1)
return -ENODEV;
/* allocate memory for our device state and initialize it */
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (dev == NULL)