4.9-stable review patch. If anyone has any objections, please let me know.
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From: Eric Biggers ebiggers@google.com
When commit 4be5a2810489 ("binder: check for binder_thread allocation failure in binder_poll()") was applied to 4.4-stable and 4.9-stable it was forgotten to release the global binder lock in the new error path. The global binder lock wasn't removed until v4.14, by commit a60b890f607d ("binder: remove global binder lock").
Fix the new error path to release the lock.
Reported-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Eric Biggers ebiggers@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/android/binder.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -2628,8 +2628,10 @@ static unsigned int binder_poll(struct f binder_lock(__func__);
thread = binder_get_thread(proc); - if (!thread) + if (!thread) { + binder_unlock(__func__); return POLLERR; + }
wait_for_proc_work = thread->transaction_stack == NULL && list_empty(&thread->todo) && thread->return_error == BR_OK;