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authorHerbert Xu <herbert@gondor.apana.org.au>2017-07-17 15:32:30 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-08-06 19:19:39 -0700
commit2148e9ab0cac6fc4ef6a8eadd5e9fdba32255187 (patch)
tree8a6c82439f999d5d31eba4fb5cff3e15b347008c /crypto/authencesn.c
parentc4efb7434a2ac4dfc26568e09e9b8fe91160834b (diff)
crypto: authencesn - Fix digest_null crash
commit 41cdf7a45389e01991ee31e3301ed83cb3e3f7dc upstream. When authencesn is used together with digest_null a crash will occur on the decrypt path. This is because normally we perform a special setup to preserve the ESN, but this is skipped if there is no authentication. However, on the post-authentication path it always expects the preservation to be in place, thus causing a crash when digest_null is used. This patch fixes this by also skipping the post-processing when there is no authentication. Fixes: 104880a6b470 ("crypto: authencesn - Convert to new AEAD...") Reported-by: Jan Tluka <jtluka@redhat.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'crypto/authencesn.c')
-rw-r--r--crypto/authencesn.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/crypto/authencesn.c b/crypto/authencesn.c
index 0c0468869e25..52154ef21b5e 100644
--- a/crypto/authencesn.c
+++ b/crypto/authencesn.c
@@ -245,6 +245,9 @@ static int crypto_authenc_esn_decrypt_tail(struct aead_request *req,
u8 *ihash = ohash + crypto_ahash_digestsize(auth);
u32 tmp[2];
+ if (!authsize)
+ goto decrypt;
+
/* Move high-order bits of sequence number back. */
scatterwalk_map_and_copy(tmp, dst, 4, 4, 0);
scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0);
@@ -253,6 +256,8 @@ static int crypto_authenc_esn_decrypt_tail(struct aead_request *req,
if (crypto_memneq(ihash, ohash, authsize))
return -EBADMSG;
+decrypt:
+
sg_init_table(areq_ctx->dst, 2);
dst = scatterwalk_ffwd(areq_ctx->dst, dst, assoclen);