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usbtmc: more sanity checking for packet size 

A malicious device can make the driver divide ny zero
with a nonsense maximum packet size.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20190820092826.17694-1-oneukum@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oliver Neukum 2019-08-20 11:28:25 +02:00 committed by Greg Kroah-Hartman
parent 3afa758cfb
commit de7b9aa633
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/class/usbtmc.c
View File

@ -2362,8 +2362,11 @@ static int usbtmc_probe(struct usb_interface *intf,
goto err_put;
}
retcode = -EINVAL;
data->bulk_in = bulk_in->bEndpointAddress;
data->wMaxPacketSize = usb_endpoint_maxp(bulk_in);
if (!data->wMaxPacketSize)
goto err_put;
dev_dbg(&intf->dev, "Found bulk in endpoint at %u\n", data->bulk_in);
data->bulk_out = bulk_out->bEndpointAddress;