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authorShikhar Khattar <shikhark@gmail.com>2010-05-20 19:40:31 +1000
committerHerbert Xu <herbert@gondor.apana.org.au>2010-05-20 19:40:31 +1000
commit921bae54693f26d01fb8e10ee6968b5cd8184551 (patch)
treec673b3511d838d303c5e201064b6a7023755f548
parent60f208d7836216885cdcd6f77a02f31dbc66f169 (diff)
crypto: authenc - Fix cryptlen calculation
This patch (applied against 2.6.34) fixes the calculation of the length of the ABLKCIPHER decrypt request ("cryptlen") after an asynchronous hash request has been completed in the AUTHENC interface. Signed-off-by: Shikhar Khattar <shikhark@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
-rw-r--r--crypto/authenc.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/crypto/authenc.c b/crypto/authenc.c
index 05eb32e0d949..b9884ee0adb6 100644
--- a/crypto/authenc.c
+++ b/crypto/authenc.c
@@ -181,6 +181,7 @@ static void authenc_verify_ahash_update_done(struct crypto_async_request *areq,
struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
+ unsigned int cryptlen = req->cryptlen;
if (err)
goto out;
@@ -196,6 +197,7 @@ static void authenc_verify_ahash_update_done(struct crypto_async_request *areq,
goto out;
authsize = crypto_aead_authsize(authenc);
+ cryptlen -= authsize;
ihash = ahreq->result + authsize;
scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
authsize, 0);
@@ -209,7 +211,7 @@ static void authenc_verify_ahash_update_done(struct crypto_async_request *areq,
ablkcipher_request_set_callback(abreq, aead_request_flags(req),
req->base.complete, req->base.data);
ablkcipher_request_set_crypt(abreq, req->src, req->dst,
- req->cryptlen, req->iv);
+ cryptlen, req->iv);
err = crypto_ablkcipher_decrypt(abreq);
@@ -228,11 +230,13 @@ static void authenc_verify_ahash_done(struct crypto_async_request *areq,
struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
+ unsigned int cryptlen = req->cryptlen;
if (err)
goto out;
authsize = crypto_aead_authsize(authenc);
+ cryptlen -= authsize;
ihash = ahreq->result + authsize;
scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
authsize, 0);
@@ -246,7 +250,7 @@ static void authenc_verify_ahash_done(struct crypto_async_request *areq,
ablkcipher_request_set_callback(abreq, aead_request_flags(req),
req->base.complete, req->base.data);
ablkcipher_request_set_crypt(abreq, req->src, req->dst,
- req->cryptlen, req->iv);
+ cryptlen, req->iv);
err = crypto_ablkcipher_decrypt(abreq);