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authorHerbert Xu <herbert@gondor.apana.org.au>2007-12-04 12:04:21 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2008-01-11 00:16:30 +0300
commit481f34ae752ac74c4cbd88a9954dd4ed10e84f81 (patch)
tree1c158f9600b189220fb5943b6263750367d10265 /crypto/authenc.c
parente236d4a89a2ffbc8aa18064161f4f159c4d89b4a (diff)
downloadlinux-481f34ae752ac74c4cbd88a9954dd4ed10e84f81.tar.xz
[CRYPTO] authenc: Fix hash verification
The previous code incorrectly included the hash in the verification which also meant that we'd crash and burn when it comes to actually verifying the hash since we'd go past the end of the SG list. This patch fixes that by subtracting authsize from cryptlen at the start. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/authenc.c')
-rw-r--r--crypto/authenc.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/crypto/authenc.c b/crypto/authenc.c
index a61dea1c2fe6..82e03ffa6245 100644
--- a/crypto/authenc.c
+++ b/crypto/authenc.c
@@ -158,7 +158,8 @@ static int crypto_authenc_encrypt(struct aead_request *req)
return crypto_authenc_hash(req);
}
-static int crypto_authenc_verify(struct aead_request *req)
+static int crypto_authenc_verify(struct aead_request *req,
+ unsigned int cryptlen)
{
struct crypto_aead *authenc = crypto_aead_reqtfm(req);
struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
@@ -170,7 +171,6 @@ static int crypto_authenc_verify(struct aead_request *req)
u8 *ohash = aead_request_ctx(req);
u8 *ihash;
struct scatterlist *src = req->src;
- unsigned int cryptlen = req->cryptlen;
unsigned int authsize;
int err;
@@ -214,16 +214,22 @@ static int crypto_authenc_decrypt(struct aead_request *req)
struct crypto_aead *authenc = crypto_aead_reqtfm(req);
struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
struct ablkcipher_request *abreq = aead_request_ctx(req);
+ unsigned int cryptlen = req->cryptlen;
+ unsigned int authsize = crypto_aead_authsize(authenc);
int err;
- err = crypto_authenc_verify(req);
+ if (cryptlen < authsize)
+ return -EINVAL;
+ cryptlen -= authsize;
+
+ err = crypto_authenc_verify(req, cryptlen);
if (err)
return err;
ablkcipher_request_set_tfm(abreq, ctx->enc);
ablkcipher_request_set_callback(abreq, aead_request_flags(req),
crypto_authenc_decrypt_done, req);
- ablkcipher_request_set_crypt(abreq, req->src, req->dst, req->cryptlen,
+ ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen,
req->iv);
return crypto_ablkcipher_decrypt(abreq);