4.18-stable review patch. If anyone has any objections, please let me know.
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From: Eric Biggers ebiggers@google.com
commit 73bf20ef3df262026c3470241ae4ac8196943ffa upstream.
The VMAC template assumes the block cipher has a 128-bit block size, but it failed to check for that. Thus it was possible to instantiate it using a 64-bit block size cipher, e.g. "vmac(cast5)", causing uninitialized memory to be used.
Add the needed check when instantiating the template.
Fixes: f1939f7c5645 ("crypto: vmac - New hash algorithm for intel_txt support") Cc: stable@vger.kernel.org # v2.6.32+ Signed-off-by: Eric Biggers ebiggers@google.com Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- crypto/vmac.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/crypto/vmac.c +++ b/crypto/vmac.c @@ -655,6 +655,10 @@ static int vmac_create(struct crypto_tem if (IS_ERR(alg)) return PTR_ERR(alg);
+ err = -EINVAL; + if (alg->cra_blocksize != 16) + goto out_put_alg; + inst = shash_alloc_instance("vmac", alg); err = PTR_ERR(inst); if (IS_ERR(inst))