linux-kernel - [PATCH] pmdomain: core: Reset genpd->states to avoid freeing invalid data

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Message-ID: <20250402120613.1116711-1-ulf.hansson@linaro.org>
Date: Wed,  2 Apr 2025 14:06:13 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Ulf Hansson <ulf.hansson@...aro.org>,
	linux-pm@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] pmdomain: core: Reset genpd->states to avoid freeing invalid data

If genpd_alloc_data() allocates data for the default power-states for the
genpd, let's make sure to also reset the pointer in the error path. This
makes sure a genpd provider driver doesn't end up trying to free the data
again, but using an invalid pointer.

Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
---
 drivers/pmdomain/core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/pmdomain/core.c b/drivers/pmdomain/core.c
index 9b2f28b34bb5..c179464047fe 100644
--- a/drivers/pmdomain/core.c
+++ b/drivers/pmdomain/core.c
@@ -2229,8 +2229,10 @@ static int genpd_alloc_data(struct generic_pm_domain *genpd)
 	return 0;
 put:
 	put_device(&genpd->dev);
-	if (genpd->free_states == genpd_free_default_power_state)
+	if (genpd->free_states == genpd_free_default_power_state) {
 		kfree(genpd->states);
+		genpd->states = NULL;
+	}
 free:
 	if (genpd_is_cpu_domain(genpd))
 		free_cpumask_var(genpd->cpus);
-- 
2.43.0