tree 6da0b953362138be40457ac4aa3aace8d41c81b6
parent c6b2ed395f12256be6ee14078647bafe27d0f8f5
author Mohan Srinivasan <srmohan@google.com> 1502306216 -0700
committer Mohan Srinivasan <srmohan@google.com> 1502393806 +0000

ANDROID: keychord: Fix races in keychord_write.

There are multiple bugs caused by threads racing in keychord_write.
1) Threads racing through this function can cause the same element to
be added to a linked list twice (multiple calls to
input_register_handler() for the same input_handler struct). And the
races can also cause an element in a linked list that doesn't exist
attempted to be removed (multiple calls to input_unregister_handler()
with the same input_handler struct).
2) The races can also cause duplicate kfree's of the keychords
struct.

Bug: 64133562
Bug: 63974334
Change-Id: I6329a4d58c665fab5d3e96ef96391e07b4941e80
Signed-off-by: Mohan Srinivasan <srmohan@google.com>