HID: hidraw: correctly deallocate memory on device disconnect
authorManoj Chourasia <mchourasia@nvidia.com>
Mon, 22 Jul 2013 10:03:13 +0000 (15:03 +0530)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 27 Sep 2013 00:18:17 +0000 (17:18 -0700)
commitd0de24dd0e200c83382cd3fff8e8c06cb6dcef2b
treef1da33204a89f07069d85c61972233c3be21993b
parent65a839f4b7fd73d2a84c2d404c94a162751e8edb
HID: hidraw: correctly deallocate memory on device disconnect

commit 212a871a3934beccf43431608c27ed2e05a476ec upstream.

This changes puts the commit 4fe9f8e203f back in place
with the fixes for slab corruption because of the commit.

When a device is unplugged, wait for all processes that
have opened the device to close before deallocating the device.

This commit was solving kernel crash because of the corruption in
rb tree of vmalloc. The rootcause was the device data pointer was
geting excessed after the memory associated with hidraw was freed.

The commit 4fe9f8e203f was buggy as it was also freeing the hidraw
first and then calling delete operation on the list associated with
that hidraw leading to slab corruption.

Signed-off-by: Manoj Chourasia <mchourasia@nvidia.com>
Tested-by: Peter Wu <lekensteyn@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/hid/hidraw.c