4.20-stable review patch. If anyone has any objections, please let me know.
------------------
From: Stephen Smalley <sds@xxxxxxxxxxxxx>
commit 5b0e7310a2a33c06edc7eb81ffc521af9b2c5610 upstream.
levdatum->level can be NULL if we encounter an error while loading
the policy during sens_read prior to initializing it. Make sure
sens_destroy handles that case correctly.
Reported-by: syzbot+6664500f0f18f07a5c0e@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Stephen Smalley <sds@xxxxxxxxxxxxx>
Signed-off-by: Paul Moore <paul@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
security/selinux/ss/policydb.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -732,7 +732,8 @@ static int sens_destroy(void *key, void
kfree(key);
if (datum) {
levdatum = datum;
- ebitmap_destroy(&levdatum->level->cat);
+ if (levdatum->level)
+ ebitmap_destroy(&levdatum->level->cat);
kfree(levdatum->level);
}
kfree(datum);
