binder: fix memory corruption in binder_transaction binder

commit 7a4408c6bd3e ("binder: make sure accesses to proc/thread are
safe") made a change to enqueue tcomplete to thread->todo before
enqueuing the transaction. However, in err_dead_proc_or_thread case,
the tcomplete is directly freed, without dequeued. It may cause the
thread->todo list to be corrupted.

So, dequeue it before freeing.

Fixes: 7a4408c6bd3e ("binder: make sure accesses to proc/thread are safe")
Signed-off-by: Xu YiPing <xuyiping@hisilicon.com>
Signed-off-by: Todd Kjos <tkjos@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index b257bb0..ab34239 100644 (file)
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -3082,6 +3082,7 @@ static void binder_transaction(struct binder_proc *proc,
 err_dead_proc_or_thread:
        return_error = BR_DEAD_REPLY;
        return_error_line = __LINE__;
+       binder_dequeue_work(proc, tcomplete);
 err_translate_failed:
 err_bad_object_type:
 err_bad_offset: