openwrt/target/linux/bcm27xx/patches-5.10/950-0581-clk-requests-Dereference-the-request-pointer-after-t.patch

From 491c6fbbe8fadead32fbe316fd5d0f21e9aa01f2 Mon Sep 17 00:00:00 2001
From: Maxime Ripard <maxime@cerno.tech>
Date: Thu, 22 Apr 2021 10:45:37 +0200
Subject: [PATCH] clk: requests: Dereference the request pointer after
 the check

The current code will first dereference the req pointer and then test if
it's NULL, resulting in a NULL pointer dereference if req is indeed
NULL. Reorder the test and derefence to avoid the issue

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/clk/clk.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2496,10 +2496,11 @@ EXPORT_SYMBOL_GPL(clk_request_start);
  */
 void clk_request_done(struct clk_request *req)
 {
-	struct clk_core *core = req->clk->core;
+	struct clk_core *core;
 
 	if (!req)
 		return;
+	core = req->clk->core;
 
 	clk_prepare_lock();