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(parent: 0620fdd) | patch
KEYS: DH: forbid using digest_null as the KDF hash
authorEric Biggers <ebiggers@google.com>
Thu, 8 Jun 2017 13:49:34 +0000 (14:49 +0100)
committerJames Morris <james.l.morris@oracle.com>
Fri, 9 Jun 2017 03:29:49 +0000 (13:29 +1000)
commitbbe240454d86be95151e0ecfd6ac55fe5ef5a6f5
tree662839ffc98b691fe598cef81a1bab0c2b123ccdtree | snapshot (tar.gz zip)
parent0620fddb56dfaf0e1034eeb69d79c73b361debbfcommit | diff
KEYS: DH: forbid using digest_null as the KDF hash

Requesting "digest_null" in the keyctl_kdf_params caused an infinite
loop in kdf_ctr() because the "null" hash has a digest size of 0.  Fix
it by rejecting hash algorithms with a digest size of 0.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: James Morris <james.l.morris@oracle.com>
security/keys/dh.c diff | blob | blame | history