fscrypt: fix dereference of NULL user_key_payload

[mirror_ubuntu-artful-kernel.git] / fs / crypto / keyinfo.c

diff --git a/fs/crypto/keyinfo.c b/fs/crypto/keyinfo.c
index 018c588c7ac3b7ac8fd78b4092332f771c6411c0..8e704d12a1cf2781087ec14d6ef6561ea9dd3236 100644 (file)
--- a/fs/crypto/keyinfo.c
+++ b/fs/crypto/keyinfo.c
@@ -109,6 +109,11 @@ static int validate_user_key(struct fscrypt_info *crypt_info,
                goto out;
        }
        ukp = user_key_payload_locked(keyring_key);
+       if (!ukp) {
+               /* key was revoked before we acquired its semaphore */
+               res = -EKEYREVOKED;
+               goto out;
+       }
        if (ukp->datalen != sizeof(struct fscrypt_key)) {
                res = -EINVAL;
                goto out;