trusted-keys: avoid scattring va_end()

We can avoid scattering va_end() within the

  va_start();
  for (;;) {

  }
  va_end();

loop, assuming that crypto_shash_init()/crypto_shash_update() return 0 on
success and negative value otherwise.

Make TSS_authhmac()/TSS_checkhmac1()/TSS_checkhmac2() similar to TSS_rawhmac()
by removing "va_end()/goto" from the loop.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reviewed-by: Jesper Juhl <jj@chaosbits.net>
Acked-by: Mimi Zohar <zohar@us.ibm.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 13 insertions, 17 deletions

diff --git a/security/keys/trusted_defined.c b/security/keys/trusted_defined.c
index f7d06776faf0..2836c6dc18a3 100644
--- a/security/keys/trusted_defined.c
+++ b/security/keys/trusted_defined.c
@@ -150,17 +150,15 @@ static int TSS_authhmac(unsigned char *digest, const unsigned char *key,
                 data = va_arg(argp, unsigned char *);
                 if (!data) {
                         ret = -EINVAL;
-                        va_end(argp);
-                        goto out;
+                        break;
                 }
                 ret = crypto_shash_update(&sdesc->shash, data, dlen);
-                if (ret < 0) {
-                        va_end(argp);
-                        goto out;
-                }
+                if (ret < 0)
+                        break;
         }
         va_end(argp);
-        ret = crypto_shash_final(&sdesc->shash, paramdigest);
+        if (!ret)
+                ret = crypto_shash_final(&sdesc->shash, paramdigest);
         if (!ret)
                 ret = TSS_rawhmac(digest, key, keylen, SHA1_DIGEST_SIZE,
                                   paramdigest, TPM_NONCE_SIZE, h1,
@@ -229,13 +227,12 @@ static int TSS_checkhmac1(unsigned char *buffer,
                         break;
                 dpos = va_arg(argp, unsigned int);
                 ret = crypto_shash_update(&sdesc->shash, buffer + dpos, dlen);
-                if (ret < 0) {
-                        va_end(argp);
-                        goto out;
-                }
+                if (ret < 0)
+                        break;
         }
         va_end(argp);
-        ret = crypto_shash_final(&sdesc->shash, paramdigest);
+        if (!ret)
+                ret = crypto_shash_final(&sdesc->shash, paramdigest);
         if (ret < 0)
                 goto out;
 
@@ -323,13 +320,12 @@ static int TSS_checkhmac2(unsigned char *buffer,
                         break;
                 dpos = va_arg(argp, unsigned int);
                 ret = crypto_shash_update(&sdesc->shash, buffer + dpos, dlen);
-                if (ret < 0) {
-                        va_end(argp);
-                        goto out;
-                }
+                if (ret < 0)
+                        break;
         }
         va_end(argp);
-        ret = crypto_shash_final(&sdesc->shash, paramdigest);
+        if (!ret)
+                ret = crypto_shash_final(&sdesc->shash, paramdigest);
         if (ret < 0)
                 goto out;