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SubjectRe: [PATCH]: Fix ALIGN() macro
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On Sat, Sep 23, 2006 at 04:36:33PM -0400, Kyle Moffett wrote:
>
> Quick question: does "crypto_hash_init()" ever return anything other
> than 0 or 1? If so this is a subtle bug, as "unlikely()" is
> implemented like this:

Good point. It's meant to be an errno value so this is a bug.

[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>
--
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
--
diff --git a/crypto/hmac.c b/crypto/hmac.c
index d52b234..b521bcd 100644
--- a/crypto/hmac.c
+++ b/crypto/hmac.c
@@ -92,13 +92,17 @@ static int hmac_init(struct hash_desc *p
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 *
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
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
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)
-
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