linux-kernel - [PATCH 5.13 143/175] ARM: omap2+: hwmod: fix potential NULL pointer access

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Date:   Tue, 10 Aug 2021 19:30:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Murphy <dmurphy@...com>,
        Tero Kristo <t-kristo@...com>,
        Kevin Hilman <khilman@...libre.com>,
        Tony Lindgren <tony@...mide.com>
Subject: [PATCH 5.13 143/175] ARM: omap2+: hwmod: fix potential NULL pointer access

From: Tero Kristo <t-kristo@...com>

commit b070f9ca78680486927b799cf6126b128a7c2c1b upstream.

omap_hwmod_get_pwrdm() may access a NULL clk_hw pointer in some failure
cases. Add a check for the case and bail out gracely if this happens.

Reported-by: Dan Murphy <dmurphy@...com>
Signed-off-by: Tero Kristo <t-kristo@...com>
Cc: stable@...r.kernel.org # v5.10+
Signed-off-by: Kevin Hilman <khilman@...libre.com>
Signed-off-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/arm/mach-omap2/omap_hwmod.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -3776,6 +3776,7 @@ struct powerdomain *omap_hwmod_get_pwrdm
 	struct omap_hwmod_ocp_if *oi;
 	struct clockdomain *clkdm;
 	struct clk_hw_omap *clk;
+	struct clk_hw *hw;
 
 	if (!oh)
 		return NULL;
@@ -3792,7 +3793,14 @@ struct powerdomain *omap_hwmod_get_pwrdm
 		c = oi->_clk;
 	}
 
-	clk = to_clk_hw_omap(__clk_get_hw(c));
+	hw = __clk_get_hw(c);
+	if (!hw)
+		return NULL;
+
+	clk = to_clk_hw_omap(hw);
+	if (!clk)
+		return NULL;
+
 	clkdm = clk->clkdm;
 	if (!clkdm)
 		return NULL;