X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=crypto%2Fxcbc.c;h=b63b633e549ce7d42370c7747cdc1fbad1f8fcb8;hb=94aca1dac6f6d21f4b07e4864baf7768cabcc6e7;hp=86727403e5ab1f0e5e7bbd15f3703046f4390548;hpb=ab1ecbabb1c7b1599b1eb70c291407c557ea4ef3;p=pandora-kernel.git

diff --git a/crypto/xcbc.c b/crypto/xcbc.c
index 86727403e5ab..b63b633e549c 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;
 }