[PATCH] nvmem: nintendo-otp: Fix potential NULL pointer dereference in nintendo_otp_probe()

[Haotian Zhang]

of_match_device() may return NULL if no match is found.
Dereferencing the return value of_id in nintendo_otp_probe()
without a check could lead to a NULL pointer dereference.

Add a check for of_id and return -ENODEV upon failure.

Fixes: 3683b761fe3a ("nvmem: nintendo-otp: Add new driver for the Wii and Wii U OTP")
Signed-off-by: Haotian Zhang <vulab@xxxxxxxxxxx>
---
 drivers/nvmem/nintendo-otp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/nvmem/nintendo-otp.c b/drivers/nvmem/nintendo-otp.c
index 355e7f1fc6d5..89b15a58bf88 100644
--- a/drivers/nvmem/nintendo-otp.c
+++ b/drivers/nvmem/nintendo-otp.c
@@ -87,6 +87,9 @@ static int nintendo_otp_probe(struct platform_device *pdev)
 		.root_only = true,
 	};
 
+	if (!of_id)
+		return -ENODEV;
+
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
-- 
2.50.1.windows.1