crypto: authenc - Find proper IV address in ablkcipher callback
Tom Lendacky [Tue, 12 Nov 2013 17:46:04 +0000 (11:46 -0600)]
commit fc019c7122dfcd69c50142b57a735539aec5da95 upstream.

When performing an asynchronous ablkcipher operation the authenc
completion callback routine is invoked, but it does not locate and use
the proper IV.

The callback routine, crypto_authenc_encrypt_done, is updated to use
the same method of calculating the address of the IV as is done in
crypto_authenc_encrypt function which sets up the callback.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

crypto/authenc.c

index ffce19d..528b00b 100644 (file)
@@ -368,9 +368,10 @@ static void crypto_authenc_encrypt_done(struct crypto_async_request *req,
        if (!err) {
                struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
                struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
-               struct ablkcipher_request *abreq = aead_request_ctx(areq);
-               u8 *iv = (u8 *)(abreq + 1) +
-                        crypto_ablkcipher_reqsize(ctx->enc);
+               struct authenc_request_ctx *areq_ctx = aead_request_ctx(areq);
+               struct ablkcipher_request *abreq = (void *)(areq_ctx->tail
+                                                           + ctx->reqoff);
+               u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(ctx->enc);
 
                err = crypto_authenc_genicv(areq, iv, 0);
        }