ion: replace userspace handle cookies with idr
authorColin Cross <ccross@android.com>
Fri, 13 Dec 2013 22:24:50 +0000 (14:24 -0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 14 Dec 2013 16:57:18 +0000 (08:57 -0800)
commit47b404580bd92ec8dd3e691020bd515f6af262af
treed8bcf5cc1b75a10f7543fa54c9dd83ce39c798c5
parent9e907654d3c0ff58fb27b51d94128a9749c7e85c
ion: replace userspace handle cookies with idr

Userspace handles should not leak kernel virtual addresses to
userspace.  They have to be validated by looking them up in an
rbtree anyways, so replace them with an idr and validate them
by using idr_find to convert the id number to the struct
ion_handle pointer.

Signed-off-by: Colin Cross <ccross@android.com>
[jstultz: modified patch to apply to staging directory]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/staging/android/ion/ion.c