This is a note to let you know that I've just added the patch titled
clk: renesas: cpg-mssr: Fix use after free if cpg_mssr_common_init() failed
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
clk-renesas-cpg-mssr-fix-use-after-free-if-cpg_mssr_.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 1079e5cd6c5febd1b88ff605ea99bbcf5403ab92
Author: Alexey Khoroshilov <khoroshilov@xxxxxxxxx>
Date: Fri Dec 23 17:40:17 2022 +0300
clk: renesas: cpg-mssr: Fix use after free if cpg_mssr_common_init() failed
[ Upstream commit fbfd614aeaa2853c2c575299dfe2458db8eff67e ]
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@xxxxxxxxx>
Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Link: https://lore.kernel.org/r/1671806417-32623-1-git-send-email-khoroshilov@xxxxxxxxx
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/clk/renesas/renesas-cpg-mssr.c b/drivers/clk/renesas/renesas-cpg-mssr.c
index 6f9612c169afe..9ffd1bf80b6a3 100644
--- a/drivers/clk/renesas/renesas-cpg-mssr.c
+++ b/drivers/clk/renesas/renesas-cpg-mssr.c
@@ -907,7 +907,6 @@ 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;
@@ -921,6 +920,8 @@ static int __init cpg_mssr_common_init(struct device *dev,
if (error)
goto out_err;
+ cpg_mssr_priv = priv;
+
return 0;
out_err:
