crypto: authencesn - Fix breakage with new ESP code

The ESP code has been updated to generate a completely linear
AD SG list.  This unfortunately broke authencesn which expects
the AD to be divided into at least three parts.

This patch fixes it to cope with the new format.  Later we will
fix it properly to accept arbitrary input and not rely on the
input being linear as part of the AEAD conversion.

Fixes: 7021b2e1cddd ("esp4: Switch to new AEAD interface")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/authencesn.c b/crypto/authencesn.c
index a3da6770bc9ed2bf66d59e8e74461829eeb4fe4e..b8efe36ce1142d0c6b0b8e45ec23965ec7135c40 100644 (file)
--- a/crypto/authencesn.c
+++ b/crypto/authencesn.c
@@ -393,8 +393,6 @@ static int crypto_authenc_esn_genicv(struct aead_request *req, u8 *iv,
        struct scatterlist *cipher = areq_ctx->cipher;
        struct scatterlist *hsg = areq_ctx->hsg;
        struct scatterlist *tsg = areq_ctx->tsg;
-       struct scatterlist *assoc1;
-       struct scatterlist *assoc2;
        unsigned int ivsize = crypto_aead_ivsize(authenc_esn);
        unsigned int cryptlen = req->cryptlen;
        struct page *dstp;
@@ -412,27 +410,19 @@ static int crypto_authenc_esn_genicv(struct aead_request *req, u8 *iv,
                cryptlen += ivsize;
        }
 
-       if (sg_is_last(assoc))
-               return -EINVAL;
-
-       assoc1 = assoc + 1;
-       if (sg_is_last(assoc1))
-               return -EINVAL;
-
-       assoc2 = assoc + 2;
-       if (!sg_is_last(assoc2))
+       if (assoc->length < 12)
                return -EINVAL;
 
        sg_init_table(hsg, 2);
-       sg_set_page(hsg, sg_page(assoc), assoc->length, assoc->offset);
-       sg_set_page(hsg + 1, sg_page(assoc2), assoc2->length, assoc2->offset);
+       sg_set_page(hsg, sg_page(assoc), 4, assoc->offset);
+       sg_set_page(hsg + 1, sg_page(assoc), 4, assoc->offset + 8);
 
        sg_init_table(tsg, 1);
-       sg_set_page(tsg, sg_page(assoc1), assoc1->length, assoc1->offset);
+       sg_set_page(tsg, sg_page(assoc), 4, assoc->offset + 4);
 
        areq_ctx->cryptlen = cryptlen;
-       areq_ctx->headlen = assoc->length + assoc2->length;
-       areq_ctx->trailen = assoc1->length;
+       areq_ctx->headlen = 8;
+       areq_ctx->trailen = 4;
        areq_ctx->sg = dst;
 
        areq_ctx->complete = authenc_esn_geniv_ahash_done;
@@ -563,8 +553,6 @@ static int crypto_authenc_esn_iverify(struct aead_request *req, u8 *iv,
        struct scatterlist *cipher = areq_ctx->cipher;
        struct scatterlist *hsg = areq_ctx->hsg;
        struct scatterlist *tsg = areq_ctx->tsg;
-       struct scatterlist *assoc1;
-       struct scatterlist *assoc2;
        unsigned int ivsize = crypto_aead_ivsize(authenc_esn);
        struct page *srcp;
        u8 *vsrc;
@@ -580,27 +568,19 @@ static int crypto_authenc_esn_iverify(struct aead_request *req, u8 *iv,
                cryptlen += ivsize;
        }
 
-       if (sg_is_last(assoc))
-               return -EINVAL;
-
-       assoc1 = assoc + 1;
-       if (sg_is_last(assoc1))
-               return -EINVAL;
-
-       assoc2 = assoc + 2;
-       if (!sg_is_last(assoc2))
+       if (assoc->length < 12)
                return -EINVAL;
 
        sg_init_table(hsg, 2);
-       sg_set_page(hsg, sg_page(assoc), assoc->length, assoc->offset);
-       sg_set_page(hsg + 1, sg_page(assoc2), assoc2->length, assoc2->offset);
+       sg_set_page(hsg, sg_page(assoc), 4, assoc->offset);
+       sg_set_page(hsg + 1, sg_page(assoc), 4, assoc->offset + 8);
 
        sg_init_table(tsg, 1);
-       sg_set_page(tsg, sg_page(assoc1), assoc1->length, assoc1->offset);
+       sg_set_page(tsg, sg_page(assoc), 4, assoc->offset + 4);
 
        areq_ctx->cryptlen = cryptlen;
-       areq_ctx->headlen = assoc->length + assoc2->length;
-       areq_ctx->trailen = assoc1->length;
+       areq_ctx->headlen = 8;
+       areq_ctx->trailen = 4;
        areq_ctx->sg = src;
 
        areq_ctx->complete = authenc_esn_verify_ahash_done;