crypto: sha512 - Fix byte counter overflow in SHA-512

The current code only increments the upper 64 bits of the SHA-512 byte
counter when the number of bytes hashed happens to hit 2^64 exactly.

This patch increments the upper 64 bits whenever the lower 64 bits
overflows.

Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
Cc: stable@kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 1 insertions, 1 deletions

diff --git a/crypto/sha512_generic.c b/crypto/sha512_generic.c
index 107f6f7be5e1..dd30f40af9f5 100644
--- a/crypto/sha512_generic.c
+++ b/crypto/sha512_generic.c
@@ -174,7 +174,7 @@ sha512_update(struct shash_desc *desc, const u8 *data, unsigned int len)
         index = sctx->count[0] & 0x7f;
 
         /* Update number of bytes */
-        if (!(sctx->count[0] += len))
+        if ((sctx->count[0] += len) < len)
                 sctx->count[1]++;
 
         part_len = 128 - index;