From e4646379a6fb5d1dcff71cc38db5e60802a21dcb Mon Sep 17 00:00:00 2001
From: moneromooo-monero <moneromooo-monero@users.noreply.github.com>
Date: Wed, 7 Feb 2018 13:39:32 +0000
Subject: [PATCH] keccak: fix mdlen bounds sanity checking

found by h908714124
---
 src/crypto/keccak.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/crypto/keccak.c b/src/crypto/keccak.c
index 7386d37a3..533021af3 100644
--- a/src/crypto/keccak.c
+++ b/src/crypto/keccak.c
@@ -81,7 +81,8 @@ void keccak(const uint8_t *in, size_t inlen, uint8_t *md, int mdlen)
     uint8_t temp[144];
     size_t i, rsiz, rsizw;
 
-    if (mdlen <= 0 || mdlen > 200 || sizeof(st) != 200)
+    static_assert(HASH_DATA_AREA <= sizeof(temp), "Bad keccak preconditions");
+    if (mdlen <= 0 || (mdlen > 100 && sizeof(st) != (size_t)mdlen))
     {
       fprintf(stderr, "Bad keccak use");
       abort();