1 files changed, 5 insertions, 1 deletions

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);