X-Git-Url: http://git.samba.org/samba.git/?p=sfrench%2Fcifs-2.6.git;a=blobdiff_plain;f=crypto%2Fxcbc.c;h=2feb0f239c38179c579cbead01e7fe168d4ea0dd;hp=86727403e5ab1f0e5e7bbd15f3703046f4390548;hb=57ad3ea0c717113e2aeb0a9a298a9e15b9037c2a;hpb=37969581301e50872a1ae84dc73962b5f7ee6b76

diff --git a/crypto/xcbc.c b/crypto/xcbc.c
index 86727403e5ab..2feb0f239c38 100644
--- a/crypto/xcbc.c
+++ b/crypto/xcbc.c
@@ -124,6 +124,11 @@ static int crypto_xcbc_digest_update2(struct hash_desc *pdesc,
 		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);
 			char *p = crypto_kmap(pg, 0) + offset;
@@ -177,7 +182,6 @@ static int crypto_xcbc_digest_update2(struct hash_desc *pdesc,
 			offset = 0;
 			pg++;
 		}
-		nbytes-=sg[i].length;
 		i++;
 	} while (nbytes>0);