path: root/crypto
diff options
authorPascal van Leeuwen <pascalvanl@gmail.com>2019-08-09 17:51:07 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2019-08-15 21:52:14 +1000
commita62084d299d950f2ad0649caf9a9b9a431346996 (patch)
treef5dde31132c5ed33931bfe8494b718647b85b59c /crypto
parent440dc9aab5286aec46b6bdf061c6eec4fd53887f (diff)
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>
Diffstat (limited to 'crypto')
1 files changed, 2 insertions, 1 deletions
diff --git a/crypto/aead.c b/crypto/aead.c
index fbf0ec93bc8e..ce035589cf57 100644
--- a/crypto/aead.c
+++ b/crypto/aead.c
@@ -70,7 +70,8 @@ int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
int err;
- if (authsize > crypto_aead_maxauthsize(tfm))
+ if ((!authsize && crypto_aead_maxauthsize(tfm)) ||
+ authsize > crypto_aead_maxauthsize(tfm))
return -EINVAL;
if (crypto_aead_alg(tfm)->setauthsize) {

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