linux/drivers/hid/hidraw.c
Rodrigo Rivas Costa 94cae1fa65 HID: hidraw: Fix crash on HIDIOCGFEATURE with a destroyed device
commit a955358d54 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.

Signed-off-by: Rodrigo Rivas Costa <rodrigorivascosta@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
2018-10-21 08:45:19 +01:00

633 lines
14 KiB