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| author | Josh Boyer <jwboyer@fedoraproject.org> | 2016-03-14 09:33:40 -0700 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-04-18 08:50:57 -0400 |
| commit | 76b69dfeb5f1bf19a6bd65991506bbb00647716b (patch) | |
| tree | 7cf43210955eb58422bb5c475556f7ee52fd0f68 | |
| parent | 1ee3901b99f165a4fa3ba85ff08d11bc2f61eec4 (diff) | |
| download | lwn-76b69dfeb5f1bf19a6bd65991506bbb00647716b.tar.gz lwn-76b69dfeb5f1bf19a6bd65991506bbb00647716b.zip | |
Input: powermate - fix oops with malicious USB descriptors
[ Upstream commit 9c6ba456711687b794dcf285856fc14e2c76074f ]
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>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
| -rw-r--r-- | drivers/input/misc/powermate.c | 3 |
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; |