[PATCH] KEYS: fix cred refcount leak in request_key_auth_new()

[Eric Biggers]

From: Eric Biggers <ebigg...@google.com>

In request_key_auth_new(), if alloc_key() or key_instantiate_and_link()
were to fail, we would leak a reference to the 'struct cred'.  Currently
this can only happen if alloc_key() fails to to allocate memory.  But it
still should be fixed, as it is a more severe bug waiting to happen.

Fixes: d84f4f992cbd ("CRED: Inaugurate COW credentials")
Signed-off-by: Eric Biggers <ebigg...@google.com>
---
 security/keys/request_key_auth.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/security/keys/request_key_auth.c b/security/keys/request_key_auth.c
index afe9d22ab361..f2f29f13ecff 100644
--- a/security/keys/request_key_auth.c
+++ b/security/keys/request_key_auth.c
@@ -227,6 +227,7 @@ struct key *request_key_auth_new(struct key *target, const 
void *callout_info,
        key_revoke(authkey);
        key_put(authkey);
 error_alloc:
+       put_cred(rka->cred);
        key_put(rka->target_key);
        key_put(rka->dest_keyring);
        kfree(rka->callout_info);
-- 
2.14.1.690.gbb1197296e-goog