Patch "binder: check for binder_thread allocation failure in binder_poll()" has been added to the 4.9-stable tree

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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 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

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-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From f88982679f54f75daa5b8eff3da72508f1e7422f Mon Sep 17 00:00:00 2001
From: Eric Biggers <ebiggers@xxxxxxxxxx>
Date: Tue, 30 Jan 2018 23:11:24 -0800
Subject: binder: check for binder_thread allocation failure in binder_poll()

From: Eric Biggers <ebiggers@xxxxxxxxxx>

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@xxxxxxxxxxxxxxxx>
Fixes: 457b9a6f09f0 ("Staging: android: add binder driver")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/android/binder.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2628,6 +2628,8 @@ 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@xxxxxxxxxx are

queue-4.9/crypto-x86-twofish-3way-fix-rbp-usage.patch
queue-4.9/binder-check-for-binder_thread-allocation-failure-in-binder_poll.patch
queue-4.9/crypto-hash-annotate-algorithms-taking-optional-key.patch
queue-4.9/crypto-hash-prevent-using-keyed-hashes-without-setting-key.patch



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