target/linux/bcm27xx/patches-5.15/950-0857-clk-Test-the-clock-pointer-in-clk_hw_get_name.patch

   1 From f8740e21bb2a6eb11da683901e22fbb6fea80dc8 Mon Sep 17 00:00:00 2001
   2 From: Maxime Ripard <maxime@cerno.tech>
   3 Date: Tue, 5 Apr 2022 15:20:27 +0200
   4 Subject: [PATCH] clk: Test the clock pointer in clk_hw_get_name()
   5
   6 Unlike __clk_get_name(), clk_hw_get_name() doesn't test wether passed
   7 clk_hw pointer is NULL or not and dereferences it directly. This can
   8 then lead to NULL pointer dereference.
   9
  10 Let's make sure the pointer isn't NULL before dereferencing it.
  11
  12 Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com> # imx8mp
  13 Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> # exynos4210, meson g12b
  14 Signed-off-by: Maxime Ripard <maxime@cerno.tech>
  15 ---
  16  drivers/clk/clk.c | 2 +-
  17  1 file changed, 1 insertion(+), 1 deletion(-)
  18
  19 --- a/drivers/clk/clk.c
  20 +++ b/drivers/clk/clk.c
  21 @@ -269,7 +269,7 @@ EXPORT_SYMBOL_GPL(__clk_get_name);
  22
  23  const char *clk_hw_get_name(const struct clk_hw *hw)
  24  {
  25 -       return hw->core->name;
  26 +       return !hw ? NULL : hw->core->name;
  27  }
  28  EXPORT_SYMBOL_GPL(clk_hw_get_name);
  29