trusted-keys: free memory bugfix

Add missing kfree(td) in tpm_seal() before the return, freeing
td on error paths as well.

Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
Acked-by: David Safford <safford@watson.ibm.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 7 insertions, 5 deletions

diff --git a/security/keys/trusted_defined.c b/security/keys/trusted_defined.c
index 975e9f29a52c..932f8687df16 100644
--- a/security/keys/trusted_defined.c
+++ b/security/keys/trusted_defined.c
@@ -511,7 +511,7 @@ static int tpm_seal(struct tpm_buf *tb, uint16_t keytype,
         /* get session for sealing key */
         ret = osap(tb, &sess, keyauth, keytype, keyhandle);
         if (ret < 0)
-                return ret;
+                goto out;
         dump_sess(&sess);
 
         /* calculate encrypted authorization value */
@@ -519,11 +519,11 @@ static int tpm_seal(struct tpm_buf *tb, uint16_t keytype,
         memcpy(td->xorwork + SHA1_DIGEST_SIZE, sess.enonce, SHA1_DIGEST_SIZE);
         ret = TSS_sha1(td->xorwork, SHA1_DIGEST_SIZE * 2, td->xorhash);
         if (ret < 0)
-                return ret;
+                goto out;
 
         ret = tpm_get_random(tb, td->nonceodd, TPM_NONCE_SIZE);
         if (ret < 0)
-                return ret;
+                goto out;
         ordinal = htonl(TPM_ORD_SEAL);
         datsize = htonl(datalen);
         pcrsize = htonl(pcrinfosize);
@@ -552,7 +552,7 @@ static int tpm_seal(struct tpm_buf *tb, uint16_t keytype,
                                    &datsize, datalen, data, 0, 0);
         }
         if (ret < 0)
-                return ret;
+                goto out;
 
         /* build and send the TPM request packet */
         INIT_BUF(tb);
@@ -572,7 +572,7 @@ static int tpm_seal(struct tpm_buf *tb, uint16_t keytype,
 
         ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, MAX_BUF_SIZE);
         if (ret < 0)
-                return ret;
+                goto out;
 
         /* calculate the size of the returned Blob */
         sealinfosize = LOAD32(tb->data, TPM_DATA_OFFSET + sizeof(uint32_t));
@@ -591,6 +591,8 @@ static int tpm_seal(struct tpm_buf *tb, uint16_t keytype,
                 memcpy(blob, tb->data + TPM_DATA_OFFSET, storedsize);
                 *bloblen = storedsize;
         }
+out:
+        kfree(td);
         return ret;
 }