There is a potential execution path in which function platform_get_resource() returns NULL. If this happens, we will end up having a NULL pointer dereference.
Fix this by replacing devm_ioremap with devm_ioremap_resource, which has the NULL check and the memory region request. This code was detected with the help of Coccinelle. Cc: [email protected] Fixes: 97b7129cd2af ("reset: hisilicon: change the definition of hisi_reset_init") Signed-off-by: Gustavo A. R. Silva <[email protected]> --- Changes in v2: - Use devm_ioremap_resource. Thanks to Stephen Boyd for pointing it out. drivers/clk/hisilicon/reset.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/clk/hisilicon/reset.c b/drivers/clk/hisilicon/reset.c index 2a5015c..43e82fa 100644 --- a/drivers/clk/hisilicon/reset.c +++ b/drivers/clk/hisilicon/reset.c @@ -109,9 +109,8 @@ struct hisi_reset_controller *hisi_reset_init(struct platform_device *pdev) return NULL; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - rstc->membase = devm_ioremap(&pdev->dev, - res->start, resource_size(res)); - if (!rstc->membase) + rstc->membase = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(rstc->membase)) return NULL; spin_lock_init(&rstc->lock); -- 2.7.4
