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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2012-09-11 12:05:45 +0800 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2012-09-11 12:05:45 +0800 |
| commit | fb6e03d937365cba54d5d8d923158562169ebfd1 (patch) | |
| tree | 9c689f58af98d14e264dbbb5e15d5b0b56e3e743 /crypto/authenc.c | |
| parent | 39c69fd2df9dab1f666478e1ecce15744cf02a3e (diff) | |
| download | linux-crypto-fb6e03d937365cba54d5d8d923158562169ebfd1.tar.gz linux-crypto-fb6e03d937365cba54d5d8d923158562169ebfd1.zip | |
crypto: authenc - Fix crash with zero-length assoc data
The authenc code doesn't deal with zero-length associated data
correctly and ends up constructing a zero-length sg entry which
causes a crash when it's fed into the crypto system.
This patch fixes this by avoiding the code-path that triggers
the SG construction if we have no associated data.
This isn't the most optimal fix as it means that we'll end up
using the fallback code-path even when we could still execute
the digest function. However, this isn't a big deal as nobody
but the test path would supply zero-length associated data.
Reported-by: Romain Francoise <romain@orebokech.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Tested-by: Romain Francoise <romain@orebokech.com>
Diffstat (limited to 'crypto/authenc.c')
| -rw-r--r-- | crypto/authenc.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/crypto/authenc.c b/crypto/authenc.c index 5ef7ba6b..d0583a44 100644 --- a/crypto/authenc.c +++ b/crypto/authenc.c @@ -336,7 +336,7 @@ static int crypto_authenc_genicv(struct aead_request *req, u8 *iv, cryptlen += ivsize; } - if (sg_is_last(assoc)) { + if (req->assoclen && sg_is_last(assoc)) { authenc_ahash_fn = crypto_authenc_ahash; sg_init_table(asg, 2); sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset); @@ -490,7 +490,7 @@ static int crypto_authenc_iverify(struct aead_request *req, u8 *iv, cryptlen += ivsize; } - if (sg_is_last(assoc)) { + if (req->assoclen && sg_is_last(assoc)) { authenc_ahash_fn = crypto_authenc_ahash; sg_init_table(asg, 2); sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset); |