From: Hui Tang tanghui20@huawei.com
[ Upstream commit 3a2390c6777e3f6662980c6cfc25cafe9e4fef98 ]
It will cause null-ptr-deref when resource_size(res) invoked, if platform_get_resource() returns NULL.
Fixes: 499fef09a323 ("reset: uniphier: add USB3 core reset control") Signed-off-by: Hui Tang tanghui20@huawei.com Reviewed-by: Kunihiko Hayashi hayashi.kunihiko@socionext.com Link: https://lore.kernel.org/r/20221114004958.258513-1-tanghui20@huawei.com Signed-off-by: Philipp Zabel p.zabel@pengutronix.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/reset/reset-uniphier-glue.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/reset/reset-uniphier-glue.c b/drivers/reset/reset-uniphier-glue.c index 146fd5d45e99..15abac9fc72c 100644 --- a/drivers/reset/reset-uniphier-glue.c +++ b/drivers/reset/reset-uniphier-glue.c @@ -47,7 +47,6 @@ static int uniphier_glue_reset_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct uniphier_glue_reset_priv *priv; struct resource *res; - resource_size_t size; int i, ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); @@ -60,7 +59,6 @@ static int uniphier_glue_reset_probe(struct platform_device *pdev) return -EINVAL;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - size = resource_size(res); priv->rdata.membase = devm_ioremap_resource(dev, res); if (IS_ERR(priv->rdata.membase)) return PTR_ERR(priv->rdata.membase); @@ -96,7 +94,7 @@ static int uniphier_glue_reset_probe(struct platform_device *pdev)
spin_lock_init(&priv->rdata.lock); priv->rdata.rcdev.owner = THIS_MODULE; - priv->rdata.rcdev.nr_resets = size * BITS_PER_BYTE; + priv->rdata.rcdev.nr_resets = resource_size(res) * BITS_PER_BYTE; priv->rdata.rcdev.ops = &reset_simple_ops; priv->rdata.rcdev.of_node = dev->of_node; priv->rdata.active_low = true;