[PATCH 5.10 318/717] memory: jz4780_nemc: Fix potential NULL dereference in jz4780_nemc_probe()

Greg Kroah-Hartman
2020-12-28T14:58:50Z

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@huawei.com
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
--
2.27.0