From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: Mimi Zohar <zohar@linux.ibm.com>,
Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
James Morris <jmorris@namei.org>,
"Serge E. Hallyn" <serge@hallyn.com>
Cc: linux-integrity@vger.kernel.org,
linux-security-module@vger.kernel.org,
linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <gustavo@embeddedor.com>
Subject: [PATCH] ima: use struct_size() in kzalloc()
Date: Wed, 29 May 2019 11:53:43 -0500 [thread overview]
Message-ID: <20190529165343.GA2584@embeddedor> (raw)
One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:
struct foo {
int stuff;
struct boo entry[];
};
instance = kzalloc(sizeof(struct foo) + count * sizeof(struct boo), GFP_KERNEL);
Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper:
instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);
This code was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
security/integrity/ima/ima_template.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/security/integrity/ima/ima_template.c b/security/integrity/ima/ima_template.c
index b631b8bc7624..b945dff2ed14 100644
--- a/security/integrity/ima/ima_template.c
+++ b/security/integrity/ima/ima_template.c
@@ -281,9 +281,8 @@ static int ima_restore_template_data(struct ima_template_desc *template_desc,
int ret = 0;
int i;
- *entry = kzalloc(sizeof(**entry) +
- template_desc->num_fields * sizeof(struct ima_field_data),
- GFP_NOFS);
+ *entry = kzalloc(struct_size(*entry, template_data,
+ template_desc->num_fields), GFP_NOFS);
if (!*entry)
return -ENOMEM;
--
2.21.0
next reply other threads:[~2019-05-29 17:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-29 16:53 Gustavo A. R. Silva [this message]
2019-08-28 18:29 ` [PATCH] ima: use struct_size() in kzalloc() Gustavo A. R. Silva
2019-08-28 18:46 ` Mimi Zohar
2019-08-28 18:51 ` Gustavo A. R. Silva
2019-08-29 3:45 ` Mimi Zohar
2019-08-29 17:16 ` Gustavo A. R. Silva
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