HID: hidraw: Fix crash on HIDIOCGFEATURE with a destroyed device
BugLink: http://bugs.launchpad.net/bugs/1768429 commit a955358d upstream. Doing `ioctl(HIDIOCGFEATURE)` in a tight loop on a hidraw device and then disconnecting the device, or unloading the driver, can cause a NULL pointer dereference. When a hidraw device is destroyed it sets 0 to `dev->exist`. Most functions check 'dev->exist' before doing its work, but `hidraw_get_report()` was missing that check. Cc: stable@vger.kernel.org Signed-off-by: Rodrigo Rivas Costa <rodrigorivascosta@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Juerg Haefliger <juergh@canonical.com> Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
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