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

commit 25c3d30c918207556ae1d6e663150ebdf902186b upstream.

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>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 parent 26cf838 commit ee6c90f9e96bc7d334f626b6076817d57cf861a1 Kent Yoder committed with gregkh Apr 5, 2012
Showing with 1 addition and 1 deletion.
  1. +1 −1 crypto/sha512_generic.c
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2 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;

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