Commit 2a7f0e53 authored by Gustavo A. R. Silva's avatar Gustavo A. R. Silva Committed by Mimi Zohar

ima: ima_api: Use struct_size() in kzalloc()

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 ima_template_entry {
	...
        struct ima_field_data template_data[0]; /* template related data */
};

instance = kzalloc(sizeof(struct ima_template_entry) + count * sizeof(struct ima_field_data), GFP_NOFS);

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_NOFS);

This code was detected with the help of Coccinelle.
Signed-off-by: default avatarGustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: default avatarMimi Zohar <zohar@linux.ibm.com>
parent fa5b5717
...@@ -45,8 +45,8 @@ int ima_alloc_init_template(struct ima_event_data *event_data, ...@@ -45,8 +45,8 @@ int ima_alloc_init_template(struct ima_event_data *event_data,
else else
template_desc = ima_template_desc_current(); template_desc = ima_template_desc_current();
*entry = kzalloc(sizeof(**entry) + template_desc->num_fields * *entry = kzalloc(struct_size(*entry, template_data,
sizeof(struct ima_field_data), GFP_NOFS); template_desc->num_fields), GFP_NOFS);
if (!*entry) if (!*entry)
return -ENOMEM; return -ENOMEM;
......
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