From 26528be6720bb40bc8844e97ee73a37e530e9c5e Mon Sep 17 00:00:00 2001 From: Todd Kjos Date: Thu, 14 Feb 2019 15:22:57 -0800 Subject: [PATCH] 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 Signed-off-by: Greg Kroah-Hartman --- drivers/android/binder.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/android/binder.c b/drivers/android/binder.c index 2dba539eb792..8685882da64c 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -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);