From: Weizhao Ouyang <o451686892@gmail.com>
Date: Mon, 4 Mar 2024 14:42:41 +0000 (+0000)
Subject: driver: rng: Fix SMCCC TRNG crash
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=1da4d327d49bb068bdc69974e0dee1391dfb30e6;p=u-boot.git

driver: rng: Fix SMCCC TRNG crash

Fix a SMCCC TRNG null pointer crash due to a failed smccc feature
binding.

Fixes: 53355bb86c25 ("drivers: rng: add smccc trng driver")
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Weizhao Ouyang <o451686892@gmail.com>
---

diff --git a/drivers/rng/smccc_trng.c b/drivers/rng/smccc_trng.c
index 5bb7ebe8a4..f59b80666b 100644
--- a/drivers/rng/smccc_trng.c
+++ b/drivers/rng/smccc_trng.c
@@ -165,7 +165,7 @@ static int smccc_trng_probe(struct udevice *dev)
 	struct smccc_trng_priv *priv = dev_get_priv(dev);
 	struct arm_smccc_res res;
 
-	if (!(smccc_trng_is_supported(smccc->invoke_fn)))
+	if (!smccc || !(smccc_trng_is_supported(smccc->invoke_fn)))
 		return -ENODEV;
 
 	/* At least one of 64bit and 32bit interfaces is available */