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crypto: vmac - require a block cipher with 128-bit block size

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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>
This commit is contained in:
Eric Biggers 2018-06-18 10:22:37 -07:00 committed by Herbert Xu
parent 38641b83eb
commit 73bf20ef3d
1 changed files with 4 additions and 0 deletions
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4
crypto/vmac.c
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@ -655,6 +655,10 @@ static int vmac_create(struct crypto_template *tmpl, struct rtattr **tb)
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))