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security: smack: fix memleak in smk_write_rules_list()

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The smack_parsed_rule structure is allocated.  If a rule is successfully
installed then the last reference to the object is lost.  This patch fixes this
leak. Moreover smack_parsed_rule is allocated on stack because it no longer
needed ofter smk_write_rules_list() is finished.

Signed-off-by: Tomasz Stanislawski <t.stanislaws@samsung.com>
This commit is contained in:
Tomasz Stanislawski 2013-06-06 09:30:50 +02:00 committed by Casey Schaufler
parent be0306bcc3
commit 470043ba99
1 changed files with 11 additions and 22 deletions
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33
security/smack/smackfs.c
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@ -447,7 +447,7 @@ static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
struct list_head *rule_list,
struct mutex *rule_lock, int format)
{
struct smack_parsed_rule *rule;
struct smack_parsed_rule rule;
char *data;
int datalen;
int rc = -EINVAL;
@ -479,47 +479,36 @@ static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
goto out;
}
rule = kzalloc(sizeof(*rule), GFP_KERNEL);
if (rule == NULL) {
rc = -ENOMEM;
goto out;
}
if (format == SMK_LONG_FMT) {
/*
* Be sure the data string is terminated.
*/
data[count] = '\0';
if (smk_parse_long_rule(data, rule, 1, 0))
goto out_free_rule;
if (smk_parse_long_rule(data, &rule, 1, 0))
goto out;
} else if (format == SMK_CHANGE_FMT) {
data[count] = '\0';
if (smk_parse_long_rule(data, rule, 1, 1))
goto out_free_rule;
if (smk_parse_long_rule(data, &rule, 1, 1))
goto out;
} else {
/*
* More on the minor hack for backward compatibility
*/
if (count == (SMK_OLOADLEN))
data[SMK_OLOADLEN] = '-';
if (smk_parse_rule(data, rule, 1))
goto out_free_rule;
if (smk_parse_rule(data, &rule, 1))
goto out;
}
if (rule_list == NULL) {
load = 1;
rule_list = &rule->smk_subject->smk_rules;
rule_lock = &rule->smk_subject->smk_rules_lock;
rule_list = &rule.smk_subject->smk_rules;
rule_lock = &rule.smk_subject->smk_rules_lock;
}
rc = smk_set_access(rule, rule_list, rule_lock, load);
if (rc == 0) {
rc = smk_set_access(&rule, rule_list, rule_lock, load);
if (rc == 0)
rc = count;
goto out;
}
out_free_rule:
kfree(rule);
out:
kfree(data);
return rc;