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authorJosh Boyer <jwboyer@fedoraproject.org>2016-03-14 19:33:40 +0300
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2016-03-14 19:36:49 +0300
commit9c6ba456711687b794dcf285856fc14e2c76074f (patch)
treed2b3ecc6afacca69b576081d21fc6a9b99bdec42 /drivers/input
parent9979c1c70724ccca8fec10012e320b8145ad5368 (diff)
downloadlinux-9c6ba456711687b794dcf285856fc14e2c76074f.tar.xz
Input: powermate - fix oops with malicious USB descriptors
The powermate driver expects at least one valid USB endpoint in its probe function. If given malicious descriptors that specify 0 for the number of endpoints, it will crash. Validate the number of endpoints on the interface before using them. The full report for this issue can be found here: http://seclists.org/bugtraq/2016/Mar/85 Reported-by: Ralf Spenneberg <ralf@spenneberg.net> Cc: stable <stable@vger.kernel.org> Signed-off-by: Josh Boyer <jwboyer@fedoraproject.org> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/misc/powermate.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/input/misc/powermate.c b/drivers/input/misc/powermate.c
index 63b539d3daba..84909a12ff36 100644
--- a/drivers/input/misc/powermate.c
+++ b/drivers/input/misc/powermate.c
@@ -307,6 +307,9 @@ static int powermate_probe(struct usb_interface *intf, const struct usb_device_i
int error = -ENOMEM;
interface = intf->cur_altsetting;
+ if (interface->desc.bNumEndpoints < 1)
+ return -EINVAL;
+
endpoint = &interface->endpoint[0].desc;
if (!usb_endpoint_is_int_in(endpoint))
return -EIO;