[CRYPTO] hmac: Fix error truncation by unlikely()

The error return values are truncated by unlikely so we need to
save it first.  Thanks to Kyle Moffett for spotting this.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 18 insertions, 6 deletions

diff --git a/crypto/hmac.c b/crypto/hmac.c
index d52b234835cf..b521bcd2b2c6 100644
--- a/crypto/hmac.c
+++ b/crypto/hmac.c
@@ -92,13 +92,17 @@ static int hmac_init(struct hash_desc *pdesc)
         struct hmac_ctx *ctx = align_ptr(ipad + bs * 2 + ds, sizeof(void *));
         struct hash_desc desc;
         struct scatterlist tmp;
+        int err;
 
         desc.tfm = ctx->child;
         desc.flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
         sg_set_buf(&tmp, ipad, bs);
 
-        return unlikely(crypto_hash_init(&desc)) ?:
-               crypto_hash_update(&desc, &tmp, bs);
+        err = crypto_hash_init(&desc);
+        if (unlikely(err))
+                return err;
+
+        return crypto_hash_update(&desc, &tmp, bs);
 }
 
 static int hmac_update(struct hash_desc *pdesc,
@@ -123,13 +127,17 @@ static int hmac_final(struct hash_desc *pdesc, u8 *out)
         struct hmac_ctx *ctx = align_ptr(digest + ds, sizeof(void *));
         struct hash_desc desc;
         struct scatterlist tmp;
+        int err;
 
         desc.tfm = ctx->child;
         desc.flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
         sg_set_buf(&tmp, opad, bs + ds);
 
-        return unlikely(crypto_hash_final(&desc, digest)) ?:
-               crypto_hash_digest(&desc, &tmp, bs + ds, out);
+        err = crypto_hash_final(&desc, digest);
+        if (unlikely(err))
+                return err;
+
+        return crypto_hash_digest(&desc, &tmp, bs + ds, out);
 }
 
 static int hmac_digest(struct hash_desc *pdesc, struct scatterlist *sg,
@@ -145,6 +153,7 @@ static int hmac_digest(struct hash_desc *pdesc, struct scatterlist *sg,
         struct hash_desc desc;
         struct scatterlist sg1[2];
         struct scatterlist sg2[1];
+        int err;
 
         desc.tfm = ctx->child;
         desc.flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
@@ -154,8 +163,11 @@ static int hmac_digest(struct hash_desc *pdesc, struct scatterlist *sg,
         sg1[1].length = 0;
         sg_set_buf(sg2, opad, bs + ds);
 
-        return unlikely(crypto_hash_digest(&desc, sg1, nbytes + bs, digest)) ?:
-               crypto_hash_digest(&desc, sg2, bs + ds, out);
+        err = crypto_hash_digest(&desc, sg1, nbytes + bs, digest);
+        if (unlikely(err))
+                return err;
+
+        return crypto_hash_digest(&desc, sg2, bs + ds, out);
 }
 
 static int hmac_init_tfm(struct crypto_tfm *tfm)