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clk: renesas: cpg-mssr: Fix use after free if cpg_mssr_common_init() failed

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[ 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: 1f7db7bbf0 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alexey Khoroshilov 2022-12-23 17:40:17 +03:00 committed by Greg Kroah-Hartman
parent f34eb1e433
commit 330b70949c
1 changed files with 2 additions and 1 deletions
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3
drivers/clk/renesas/renesas-cpg-mssr.c
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@ -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: