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usb: gadgetfs: restrict upper bound on device configuration size

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commit 0994b0a257557e18ee8f0b7c5f0f73fe2b54eec1 upstream.

Andrey Konovalov reported that we were not properly checking the upper
limit before of a device configuration size before calling
memdup_user(), which could cause some problems.

So set the upper limit to PAGE_SIZE * 4, which should be good enough for
all devices.

Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2016-12-06 08:36:29 +01:00
parent 9cc601b40d
commit 10a4380ea1
1 changed files with 2 additions and 1 deletions
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3
drivers/usb/gadget/legacy/inode.c
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@ -1783,7 +1783,8 @@ dev_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
}
spin_unlock_irq(&dev->lock);
if (len < (USB_DT_CONFIG_SIZE + USB_DT_DEVICE_SIZE + 4))
if ((len < (USB_DT_CONFIG_SIZE + USB_DT_DEVICE_SIZE + 4)) ||
(len > PAGE_SIZE * 4))
return -EINVAL;
/* we might need to change message format someday */