From fbfd614aeaa2853c2c575299dfe2458db8eff67e Mon Sep 17 00:00:00 2001
From: Alexey Khoroshilov <khoroshilov@ispras.ru>
Date: Fri, 23 Dec 2022 17:40:17 +0300
Subject: [PATCH] clk: renesas: cpg-mssr: Fix use after free if cpg_mssr_common_init() failed
Git-commit: fbfd614aeaa2853c2c575299dfe2458db8eff67e
Patch-mainline: v6.3-rc1
References: git-fixes
If cpg_mssr_common_init() fails after assigning priv to global variable
cpg_mssr_priv, it deallocates priv, but cpg_mssr_priv keeps dangling
pointer that potentially can be used later.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: 1f7db7bbf031 ("clk: renesas: cpg-mssr: Add early clock support")
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/1671806417-32623-1-git-send-email-khoroshilov@ispras.ru
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/clk/renesas/renesas-cpg-mssr.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/clk/renesas/renesas-cpg-mssr.c b/drivers/clk/renesas/renesas-cpg-mssr.c
index 1a0cdf001b2f..5dce9779324d 100644
--- a/drivers/clk/renesas/renesas-cpg-mssr.c
+++ b/drivers/clk/renesas/renesas-cpg-mssr.c
@@ -989,7 +989,6 @@ static int __init cpg_mssr_common_init(struct device *dev,
goto out_err;
}
- cpg_mssr_priv = priv;
priv->num_core_clks = info->num_total_core_clks;
priv->num_mod_clks = info->num_hw_mod_clks;
priv->last_dt_core_clk = info->last_dt_core_clk;
@@ -1019,6 +1018,8 @@ static int __init cpg_mssr_common_init(struct device *dev,
if (error)
goto out_err;
+ cpg_mssr_priv = priv;
+
return 0;
out_err:
--
2.35.3