diff options
| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-12-06 08:36:29 +0100 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2017-01-02 10:55:28 +0200 |
| commit | 0994b0a257557e18ee8f0b7c5f0f73fe2b54eec1 (patch) | |
| tree | 40edc31af2f6dc5a7d9ee15de153662de6a9158e /drivers/usb/gadget/legacy | |
| parent | bcdbeb844773333d2d1c08004f3b3e25921040e5 (diff) | |
| download | linux-0994b0a257557e18ee8f0b7c5f0f73fe2b54eec1.tar.bz2 | |
usb: gadgetfs: restrict upper bound on device configuration size
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>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb/gadget/legacy')
| -rw-r--r-- | drivers/usb/gadget/legacy/inode.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c index e8f4102d19df..48f1409b438a 100644 --- a/drivers/usb/gadget/legacy/inode.c +++ b/drivers/usb/gadget/legacy/inode.c @@ -1762,7 +1762,8 @@ 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 */ |