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pmdomain: core: Fix error checking in genpd_dev_pm_attach_by_id()

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[ Upstream commit 0f5757667e ]

The error checking for of_count_phandle_with_args() does not handle
negative error codes correctly.  The problem is that "index" is a u32 so
in the condition "if (index >= num_domains)" negative error codes stored
in "num_domains" are type promoted to very high positive values and
"index" is always going to be valid.

Test for negative error codes first and then test if "index" is valid.

Fixes: 3ccf3f0cd1 ("PM / Domains: Enable genpd_dev_pm_attach_by_id|name() for single PM domain")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/aBxPQ8AI8N5v-7rL@stanley.mountain
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Carpenter
2025-05-08 09:29:23 +03:00
committed by Greg Kroah-Hartman
parent 4f091ad086
commit 73b8f31337
1 changed files with 1 additions and 1 deletions
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drivers/base/power/domain.c
+1 -1
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@@ -2856,7 +2856,7 @@ struct device *genpd_dev_pm_attach_by_id(struct device *dev,
/* Verify that the index is within a valid range. */
num_domains = of_count_phandle_with_args(dev->of_node, "power-domains",
"#power-domain-cells");
if (index >= num_domains)
if (num_domains < 0 || index >= num_domains)
return NULL;
/* Allocate and register device on the genpd bus. */