This is a note to let you know that I've just added the patch titled
binder: check for binder_thread allocation failure in binder_poll()
to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: binder-check-for-binder_thread-allocation-failure-in-binder_poll.patch and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From f88982679f54f75daa5b8eff3da72508f1e7422f Mon Sep 17 00:00:00 2001
From: Eric Biggers ebiggers@google.com Date: Tue, 30 Jan 2018 23:11:24 -0800 Subject: binder: check for binder_thread allocation failure in binder_poll()
From: Eric Biggers ebiggers@google.com
commit f88982679f54f75daa5b8eff3da72508f1e7422f upstream.
If the kzalloc() in binder_get_thread() fails, binder_poll() dereferences the resulting NULL pointer.
Fix it by returning POLLERR if the memory allocation failed.
This bug was found by syzkaller using fault injection.
Reported-by: syzbot syzkaller@googlegroups.com Fixes: 457b9a6f09f0 ("Staging: android: add binder driver") Cc: stable@vger.kernel.org Signed-off-by: Eric Biggers ebiggers@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/android/binder.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -2622,6 +2622,8 @@ static unsigned int binder_poll(struct f binder_lock(__func__);
thread = binder_get_thread(proc); + if (!thread) + return POLLERR;
wait_for_proc_work = thread->transaction_stack == NULL && list_empty(&thread->todo) && thread->return_error == BR_OK;
Patches currently in stable-queue which might be from ebiggers@google.com are
queue-4.4/crypto-x86-twofish-3way-fix-rbp-usage.patch queue-4.4/binder-check-for-binder_thread-allocation-failure-in-binder_poll.patch