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 <herbert@gondor.apana.org.au>
diff --git a/crypto/shash.c b/crypto/shash.c
index 834d9d2..7713b52 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -240,12 +240,17 @@
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;
}