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

   1 From 491c6fbbe8fadead32fbe316fd5d0f21e9aa01f2 Mon Sep 17 00:00:00 2001
   2 From: Maxime Ripard <maxime@cerno.tech>
   3 Date: Thu, 22 Apr 2021 10:45:37 +0200
   4 Subject: [PATCH] clk: requests: Dereference the request pointer after
   5  the check
   6
   7 The current code will first dereference the req pointer and then test if
   8 it's NULL, resulting in a NULL pointer dereference if req is indeed
   9 NULL. Reorder the test and derefence to avoid the issue
  10
  11 Signed-off-by: Maxime Ripard <maxime@cerno.tech>
  12 ---
  13  drivers/clk/clk.c | 3 ++-
  14  1 file changed, 2 insertions(+), 1 deletion(-)
  15
  16 --- a/drivers/clk/clk.c
  17 +++ b/drivers/clk/clk.c
  18 @@ -2520,10 +2520,11 @@ EXPORT_SYMBOL_GPL(clk_request_start);
  19   */
  20  void clk_request_done(struct clk_request *req)
  21  {
  22 -       struct clk_core *core = req->clk->core;
  23 +       struct clk_core *core;
  24
  25         if (!req)
  26                 return;
  27 +       core = req->clk->core;
  28
  29         clk_prepare_lock();
  30