key->type->instantiate can be NULL, add NULL checking to prevent NULL pointer dereference in __key_instantiate_and_link().
Signed-off-by: Geliang Tang <geliangt...@gmail.com> --- security/keys/key.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/security/keys/key.c b/security/keys/key.c index 44a80d6741a1..ae3cc11be0d2 100644 --- a/security/keys/key.c +++ b/security/keys/key.c @@ -438,7 +438,8 @@ static int __key_instantiate_and_link(struct key *key, /* can't instantiate twice */ if (key->state == KEY_IS_UNINSTANTIATED) { /* instantiate the key */ - ret = key->type->instantiate(key, prep); + if (key->type->instantiate) + ret = key->type->instantiate(key, prep); if (ret == 0) { /* mark the key as being instantiated */ -- 2.17.1