tree 042a052d4501d3a777af5b0faea46a86c23eb234
parent 52969a9cb90f6ebdeba2be350787c314c8585fd2
author Russell King <rmk+kernel@arm.linux.org.uk> 1444419813 +0100
committer chrmhoffmann <chrmhoffmann@gmail.com> 1586074913 +0200

crypto: ahash - ensure statesize is non-zero

commit 8996eafdcbad149ac0f772fb1649fbb75c482a6a upstream.

Unlike shash algorithms, ahash drivers must implement export
and import as their descriptors may contain hardware state and
cannot be exported as is.  Unfortunately some ahash drivers did
not provide them and end up causing crashes with algif_hash.

This patch adds a check to prevent these drivers from registering
ahash algorithms until they are fixed.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Zefan Li <lizefan@huawei.com>