From: Zhang Changzhong zhangchangzhong@huawei.com
[ Upstream commit 4bfa07300b9334b487ed4f3d4901c35ebb31b7ca ]
platform_get_resource() may fail and return NULL, so we should better check it's return value to avoid a NULL pointer dereference a bit later in the code.
This is detected by Coccinelle semantic patch.
Fixes: 911a88829725 ("memory: jz4780-nemc: driver for the NEMC on JZ4780 SoCs") Signed-off-by: Zhang Changzhong zhangchangzhong@huawei.com Acked-by: Paul Cercueil paul@crapouillou.net Link: https://lore.kernel.org/r/1607070717-32880-1-git-send-email-zhangchangzhong@... Signed-off-by: Krzysztof Kozlowski krzk@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/memory/jz4780-nemc.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/memory/jz4780-nemc.c b/drivers/memory/jz4780-nemc.c index 3ec5cb0fce1ee..465ea92990d7e 100644 --- a/drivers/memory/jz4780-nemc.c +++ b/drivers/memory/jz4780-nemc.c @@ -291,6 +291,8 @@ static int jz4780_nemc_probe(struct platform_device *pdev) nemc->dev = dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -EINVAL;
/* * The driver currently only uses the registers up to offset