oob read in do_adb_query function

[Benjamin Herrenschmidt]

On Wed, 2022-07-13 at 09:54 +0800, sohu0106 wrote:
> 
> 
> In do_adb_query function of drivers/macintosh/adb.c, req->data is
> copy form userland. the  parameter "req->data[2]" is Missing check,
> the array size of adb_handler[] is 16, so "adb_handler[req-
> >data[2]].original_address" and "adb_handler[req-
> >data[2]].handler_id" will lead to oob read.

Thanks ! Can you send this with a proper Signed-off-by so we can apply
directly ?

Cheers,
Ben.
> 
> 
> diff --git a/adb.c b/adb.c_patch
> index 73b3961..8a5604b 100644
> --- a/adb.c
> +++ b/adb.c_patch
> @@ -647,7 +647,7 @@ do_adb_query(struct adb_request *req)
> 
> 
>         switch(req->data[1]) {
>         case ADB_QUERY_GETDEVINFO:
> -               if (req->nbytes < 3)
> +               if (req->nbytes < 3 || req->data[2] > 16)
>                         break;
>                 mutex_lock(&adb_handler_mutex);
>                 req->reply[0] = adb_handler[req-