Commit 26528be6 authored Feb 14, 2019 by Todd Kjos Committed by Greg Kroah-Hartman Feb 15, 2019

binder: fix handling of misaligned binder object



Fixes crash found by syzbot:
kernel BUG at drivers/android/binder_alloc.c:LINE! (2)

Reported-and-tested-by:  <syzbot+55de1eb4975dec156d8f@syzkaller.appspotmail.com>
Signed-off-by: Todd Kjos <tkjos@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 36f30937

drivers/android/binder.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -2057,7 +2057,7 @@ static size_t binder_get_object(struct binder_proc *proc,
		size_t object_size = 0;

		read_size = min_t(size_t, sizeof(*object), buffer->data_size - offset);
		if (read_size < sizeof(*hdr))
		if (read_size < sizeof(*hdr) \|\| !IS_ALIGNED(offset, sizeof(u32)))
		return 0;
		binder_alloc_copy_from_buffer(&proc->alloc, object, buffer,
		offset, read_size);