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ARM: omap2+: hwmod: fix potential NULL pointer access

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commit b070f9ca78 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@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Cc: stable@vger.kernel.org # v5.10+
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tero Kristo 2021-07-20 11:47:10 -07:00 committed by Greg Kroah-Hartman
parent 9851ad2f71
commit 3d7d2d2b06
1 changed files with 9 additions and 1 deletions
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10
arch/arm/mach-omap2/omap_hwmod.c
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@ -3777,6 +3777,7 @@ struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh)
struct omap_hwmod_ocp_if *oi; struct omap_hwmod_ocp_if *oi;
struct clockdomain *clkdm; struct clockdomain *clkdm;
struct clk_hw_omap *clk; struct clk_hw_omap *clk;
struct clk_hw *hw;
if (!oh) if (!oh)
return NULL; return NULL;
@ -3793,7 +3794,14 @@ struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh)
c = oi->_clk; 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; clkdm = clk->clkdm;
if (!clkdm) if (!clkdm)
return NULL; return NULL;