Currently ima_lsm_copy_rule() set the arg_p field of the source rule to
NULL, so that the source rule could be freed afterward. It does not make
sense for this behavior to be inside a "copy" function. So move it
outside and let the caller handle this field.
As of now, the only user of ima_lsm_copy_rule() is
ima_lsm_update_rule(). In ima_lsm_update_rule(), we would like to free
only the lsm.rule in the old rule entry, and leave arg_p untouch. In
this case, it's better to use ima_filter_rule_free() directly and not
introduce another for loop to set arg_p to NULL.
Signed-off-by: GUO Zihua <guozihua@xxxxxxxxxx>
---
security/integrity/ima/ima_policy.c | 10 +++-------
1 file changed, 3 insertions(+), 7 deletions(-)
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index a8802b8da946..8040215c0252 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -398,12 +398,6 @@ static struct ima_rule_entry *ima_lsm_copy_rule(struct ima_rule_entry *entry)
nentry->lsm[i].type = entry->lsm[i].type;
nentry->lsm[i].args_p = entry->lsm[i].args_p;
- /*
- * Remove the reference from entry so that the associated
- * memory will not be freed during a later call to
- * ima_lsm_free_rule(entry).
- */
- entry->lsm[i].args_p = NULL;
ima_filter_rule_init(nentry->lsm[i].type, Audit_equal,
nentry->lsm[i].args_p,
@@ -417,6 +411,7 @@ static struct ima_rule_entry *ima_lsm_copy_rule(struct ima_rule_entry *entry)
static int ima_lsm_update_rule(struct ima_rule_entry *entry)
{
+ int i;
struct ima_rule_entry *nentry;
nentry = ima_lsm_copy_rule(entry);
@@ -431,7 +426,8 @@ static int ima_lsm_update_rule(struct ima_rule_entry *entry)
* references and the entry itself. All other memory references will now
* be owned by nentry.
*/
- ima_lsm_free_rule(entry);
+ for (i = 0; i < MAX_LSM_RULES; i++)
+ ima_filter_rule_free(entry->lsm[i].rule);
kfree(entry);
return 0;
--
2.17.1
