1 files changed, 12 insertions, 0 deletions

diff --git a/crypto/algapi.c b/crypto/algapi.c
index 60d7366ed343..9a636f961572 100644
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -167,6 +167,18 @@ void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
 
                         spawn->alg = NULL;
                         spawns = &inst->alg.cra_users;
+
+                        /*
+                         * We may encounter an unregistered instance here, since
+                         * an instance's spawns are set up prior to the instance
+                         * being registered.  An unregistered instance will have
+                         * NULL ->cra_users.next, since ->cra_users isn't
+                         * properly initialized until registration.  But an
+                         * unregistered instance cannot have any users, so treat
+                         * it the same as ->cra_users being empty.
+                         */
+                        if (spawns->next == NULL)
+                                break;
                 }
         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
                                               &secondary_spawns)));