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binder: check for binder_thread allocation failure in binder_poll()

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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: 457b9a6f09 ("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>
This commit is contained in:
Eric Biggers 2018-01-30 23:11:24 -08:00 • committed by Greg Kroah-Hartman
parent 2dfe49da48
commit 4be5a28104
1 changed files with 2 additions and 0 deletions
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2
drivers/android/binder.c
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@ -2628,6 +2628,8 @@ static unsigned int binder_poll(struct file *filp,
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;