[PATCH 3.16 17/83] selinux: fix memory leak in policydb_init()

[Ben Hutchings]

3.16.78-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Ondrej Mosnacek <omosnace@xxxxxxxxxx>

commit 45385237f65aeee73641f1ef737d7273905a233f upstream.

Since roles_init() adds some entries to the role hash table, we need to
destroy also its keys/values on error, otherwise we get a memory leak in
the error path.

Reported-by: syzbot+fee3a14d4cdf92646287@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Ondrej Mosnacek <omosnace@xxxxxxxxxx>
Signed-off-by: Paul Moore <paul@xxxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 security/selinux/ss/policydb.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -261,6 +261,8 @@ static int rangetr_cmp(struct hashtab *h
 	return v;
 }
 
+static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap);
+
 /*
  * Initialize a policy database structure.
  */
@@ -304,8 +306,10 @@ static int policydb_init(struct policydb
 out:
 	hashtab_destroy(p->filename_trans);
 	hashtab_destroy(p->range_tr);
-	for (i = 0; i < SYM_NUM; i++)
+	for (i = 0; i < SYM_NUM; i++) {
+		hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
 		hashtab_destroy(p->symtab[i].table);
+	}
 	return rc;
 }