Merge tag 'block-5.14-2021-07-30' of git://git.kernel.dk/linux-block

[linux-2.6-microblaze.git] / drivers / misc / fastrpc.c

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index f12e909..beda610 100644 (file)
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -950,6 +950,11 @@ static int fastrpc_internal_invoke(struct fastrpc_user *fl,  u32 kernel,
        if (!fl->cctx->rpdev)
                return -EPIPE;
 
+       if (handle == FASTRPC_INIT_HANDLE && !kernel) {
+               dev_warn_ratelimited(fl->sctx->dev, "user app trying to send a kernel RPC message (%d)\n",  handle);
+               return -EPERM;
+       }
+
        ctx = fastrpc_context_alloc(fl, kernel, sc, args);
        if (IS_ERR(ctx))
                return PTR_ERR(ctx);