X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=crypto%2Fxcbc.c;h=b63b633e549ce7d42370c7747cdc1fbad1f8fcb8;hb=bd3e76105d4478ab89951a52d1a35250d24a9f16;hp=789cdeee6b7d65a0bac384d66f3e1233aca6880c;hpb=42c271c6c538857cb13c5ead5184d264d745f675;p=mv-sheeva.git

diff --git a/crypto/xcbc.c b/crypto/xcbc.c
index 789cdeee6b7..b63b633e549 100644
--- a/crypto/xcbc.c
+++ b/crypto/xcbc.c
@@ -116,13 +116,16 @@ static int crypto_xcbc_digest_update2(struct hash_desc *pdesc,
 	struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent);
 	struct crypto_cipher *tfm = ctx->child;
 	int bs = crypto_hash_blocksize(parent);
-	unsigned int i = 0;
 
-	do {
+	for (;;) {
+		struct page *pg = sg_page(sg);
+		unsigned int offset = sg->offset;
+		unsigned int slen = sg->length;
 
-		struct page *pg = sg_page(&sg[i]);
-		unsigned int offset = sg[i].offset;
-		unsigned int slen = sg[i].length;
+		if (unlikely(slen > nbytes))
+			slen = nbytes;
+
+		nbytes -= slen;
 
 		while (slen > 0) {
 			unsigned int len = min(slen, ((unsigned int)(PAGE_SIZE)) - offset);
@@ -177,9 +180,11 @@ static int crypto_xcbc_digest_update2(struct hash_desc *pdesc,
 			offset = 0;
 			pg++;
 		}
-		nbytes-=sg[i].length;
-		i++;
-	} while (nbytes>0);
+
+		if (!nbytes)
+			break;
+		sg = scatterwalk_sg_next(sg);
+	}
 
 	return 0;
 }
@@ -301,13 +306,14 @@ static struct crypto_instance *xcbc_alloc(struct rtattr **tb)
 	alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
 				  CRYPTO_ALG_TYPE_MASK);
 	if (IS_ERR(alg))
-		return ERR_PTR(PTR_ERR(alg));
+		return ERR_CAST(alg);
 
 	switch(alg->cra_blocksize) {
 	case 16:
 		break;
 	default:
-		return ERR_PTR(PTR_ERR(alg));
+		inst = ERR_PTR(-EINVAL);
+		goto out_put_alg;
 	}
 
 	inst = crypto_alloc_instance("xcbc", alg);
@@ -320,10 +326,7 @@ static struct crypto_instance *xcbc_alloc(struct rtattr **tb)
 	inst->alg.cra_alignmask = alg->cra_alignmask;
 	inst->alg.cra_type = &crypto_hash_type;
 
-	inst->alg.cra_hash.digestsize =
-		(alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
-		CRYPTO_ALG_TYPE_HASH ? alg->cra_hash.digestsize :
-				       alg->cra_blocksize;
+	inst->alg.cra_hash.digestsize = alg->cra_blocksize;
 	inst->alg.cra_ctxsize = sizeof(struct crypto_xcbc_ctx) +
 				ALIGN(inst->alg.cra_blocksize * 3, sizeof(void *));
 	inst->alg.cra_init = xcbc_init_tfm;