From cbc86b9161b40f95caee0e56381b68956fc28cc4 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Wed, 15 Jul 2009 21:26:41 +0800 Subject: crypto: shash - Fix async finup handling of null digest When shash_ahash_finup encounters a null request, we end up not calling the underlying final function. This patch fixes that. Signed-off-by: Herbert Xu --- crypto/shash.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'crypto/shash.c') diff --git a/crypto/shash.c b/crypto/shash.c index 834d9d24cdae..7713b520bc98 100644 --- a/crypto/shash.c +++ b/crypto/shash.c @@ -240,12 +240,17 @@ int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc) struct crypto_hash_walk walk; int nbytes; - for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0; - nbytes = crypto_hash_walk_done(&walk, nbytes)) + nbytes = crypto_hash_walk_first(req, &walk); + if (!nbytes) + return crypto_shash_final(desc, req->result); + + do { nbytes = crypto_hash_walk_last(&walk) ? crypto_shash_finup(desc, walk.data, nbytes, req->result) : crypto_shash_update(desc, walk.data, nbytes); + nbytes = crypto_hash_walk_done(&walk, nbytes); + } while (nbytes > 0); return nbytes; } -- cgit v1.2.3