crypto: ahash - Fix setkey crash

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi:

This patch fixes a crash caused by the new ahash code and hmac.

commit a70c522520d967844c01fa01459edc698fc54544
Author: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Date:   Wed Jul 15 20:39:05 2009 +0800

    crypto: ahash - Fix setkey crash
    
    When the alignment check was made unconditional for ahash we
    may end up crashing on shash algorithms because we're always
    calling alg->setkey instead of tfm->setkey.
    
    This patch fixes it.
    
    Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>

diff --git a/crypto/ahash.c b/crypto/ahash.c
index ac0798d..28a33d0 100644
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -145,7 +145,6 @@ int crypto_hash_walk_first_compat(struct hash_desc *hdesc,
 static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
 				unsigned int keylen)
 {
-	struct ahash_alg *ahash = crypto_ahash_alg(tfm);
 	unsigned long alignmask = crypto_ahash_alignmask(tfm);
 	int ret;
 	u8 *buffer, *alignbuffer;
@@ -158,7 +157,7 @@ static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
 
 	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
 	memcpy(alignbuffer, key, keylen);
-	ret = ahash->setkey(tfm, alignbuffer, keylen);
+	ret = tfm->setkey(tfm, alignbuffer, keylen);
 	kzfree(buffer);
 	return ret;
 }
@@ -166,13 +165,12 @@ static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
 int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
 			unsigned int keylen)
 {
-	struct ahash_alg *ahash = crypto_ahash_alg(tfm);
 	unsigned long alignmask = crypto_ahash_alignmask(tfm);
 
 	if ((unsigned long)key & alignmask)
 		return ahash_setkey_unaligned(tfm, key, keylen);
 
-	return ahash->setkey(tfm, key, keylen);
+	return tfm->setkey(tfm, key, keylen);
 }
 EXPORT_SYMBOL_GPL(crypto_ahash_setkey);

Thanks,
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Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
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