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crypto: aead - Do not allow authsize=0 if auth. alg has digestsize>0
Return -EINVAL on an attempt to set the authsize to 0 with an auth. algorithm with a non-zero digestsize (i.e. anything but digest_null) as authenticating the data and then throwing away the result does not make any sense at all. The digestsize zero exception is for use with digest_null for testing purposes only. Signed-off-by: Pascal van Leeuwen <pvanleeuwen@verimatrix.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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@ -70,7 +70,8 @@ int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
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{
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int err;
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if (authsize > crypto_aead_maxauthsize(tfm))
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if ((!authsize && crypto_aead_maxauthsize(tfm)) ||
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authsize > crypto_aead_maxauthsize(tfm))
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return -EINVAL;
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if (crypto_aead_alg(tfm)->setauthsize) {
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