linux-kernel - [PATCH] ima: Fix misuse of dereference of pointer in template_desc_init

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Message-ID: <20221112092719.224888-1-xiujianfeng@huawei.com>
Date:   Sat, 12 Nov 2022 17:27:19 +0800
From:   Xiu Jianfeng <xiujianfeng@...wei.com>
To:     <zohar@...ux.ibm.com>, <dmitry.kasatkin@...il.com>,
        <paul@...l-moore.com>, <jmorris@...ei.org>, <serge@...lyn.com>,
        <roberto.sassu@...ito.it>
CC:     <linux-integrity@...r.kernel.org>,
        <linux-security-module@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <roberto.sassu@...wei.com>
Subject: [PATCH] ima: Fix misuse of dereference of pointer in template_desc_init_fields()

The input parameter @fields is type of struct ima_template_field ***, so
when allocates array memory for @fields, the size of element should be
sizeof(**field) instead of sizeof(*field).

Actually the original code would not cause any runtime error, but it's
better to make it logically right.

Fixes: adf53a778a0a ("ima: new templates management mechanism")
Signed-off-by: Xiu Jianfeng <xiujianfeng@...wei.com>
---
 security/integrity/ima/ima_template.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/security/integrity/ima/ima_template.c b/security/integrity/ima/ima_template.c
index 49f0626928a1..04c49f05cb74 100644
--- a/security/integrity/ima/ima_template.c
+++ b/security/integrity/ima/ima_template.c
@@ -245,11 +245,11 @@ int template_desc_init_fields(const char *template_fmt,
 	}
 
 	if (fields && num_fields) {
-		*fields = kmalloc_array(i, sizeof(*fields), GFP_KERNEL);
+		*fields = kmalloc_array(i, sizeof(**fields), GFP_KERNEL);
 		if (*fields == NULL)
 			return -ENOMEM;
 
-		memcpy(*fields, found_fields, i * sizeof(*fields));
+		memcpy(*fields, found_fields, i * sizeof(**fields));
 		*num_fields = i;
 	}
 
-- 
2.17.1