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binder: check for binder_thread allocation failure in binder_poll()

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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 7928b2cbe5
commit f88982679f
1 changed files with 2 additions and 0 deletions
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2
drivers/android/binder.c
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@ -4391,6 +4391,8 @@ static __poll_t binder_poll(struct file *filp,
bool wait_for_proc_work;
thread = binder_get_thread(proc);
if (!thread)
return POLLERR;
binder_inner_proc_lock(thread->proc);
thread->looper |= BINDER_LOOPER_STATE_POLL;