tree f5cc0daa868fb02e373dcedd02d6368ad21d10f0
parent 1d49e2ab766df649c540959a96f1ab839471fbe8
author Rodrigo Rivas Costa <rodrigorivascosta@gmail.com> 1522969776 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1524555256 +0200

HID: hidraw: Fix crash on HIDIOCGFEATURE with a destroyed device

commit a955358d54695e4ad9f7d6489a7ac4d69a8fc711 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>