Re: [PATCH v5 4/4] powerpc: load firmware trusted keys/hashes into kernel keyring

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On 10/24/19 5:58 PM, Nayna Jain wrote:

+
+/*
+ * Get a certificate list blob from the named secure variable.
+ */
+static __init void *get_cert_list(u8 *key, unsigned long keylen, uint64_t *size)
+{
+	int rc;
+	void *db;
+
+	rc = secvar_ops->get(key, keylen, NULL, size);
+	if (rc) {
+		pr_err("Couldn't get size: %d\n", rc);
+		return NULL;
+	}
+
+	db = kmalloc(*size, GFP_KERNEL);

Is there a MIN\MAX limit on size that should be validated here before memory allocation?

+	if (!db)
+		return NULL;
+
+	rc = secvar_ops->get(key, keylen, db, size);
+	if (rc) {
+		kfree(db);
+		pr_err("Error reading db var: %d\n", rc);
+		return NULL;
nit: set db to NULL and return from the end of the function.

+	}
+
+	return db;
+}




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