[PATCH v2 2/3] KEYS: don't revoke uninstantiated key in request_key_auth_new()

From: Eric Biggers
Date: Thu Sep 21 2017 - 16:59:43 EST

From: Eric Biggers <ebiggers@xxxxxxxxxx>

If key_instantiate_and_link() were to fail (which fortunately isn't
possible currently), the call to key_revoke(authkey) would crash with a
NULL pointer dereference in request_key_auth_revoke() because the key
has not yet been instantiated.

Fix this by removing the call to key_revoke(). key_put() is sufficient,
as it's not possible for an uninstantiated authkey to have been used for
anything yet.

Fixes: b5f545c880a2 ("[PATCH] keys: Permit running process to instantiate keys")
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
security/keys/request_key_auth.c | 1 -
1 file changed, 1 deletion(-)

diff --git a/security/keys/request_key_auth.c b/security/keys/request_key_auth.c
index 8f12645945ca..2df92b619a38 100644
--- a/security/keys/request_key_auth.c
+++ b/security/keys/request_key_auth.c
@@ -220,7 +220,6 @@ struct key *request_key_auth_new(struct key *target, const void *callout_info,
return authkey;

- key_revoke(authkey);