From ee5769f31fc5bef0c0f5f6977523918af892fa3b Mon Sep 17 00:00:00 2001
From: Matt Johnston <matt@ucc.asn.au>
Date: Thu, 25 May 2017 00:09:40 +0800
Subject: [PATCH] avoid NULL argument to base64 decode
--HG--
branch : fuzz
---
signkey.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/signkey.c b/signkey.c
index 3d78e350..19a2c082 100644
--- a/signkey.c
+++ b/signkey.c
@@ -577,6 +577,10 @@ int cmp_base64_key(const unsigned char* keyblob, unsigned int keybloblen,
/* now we have the actual data */
len = line->len - line->pos;
+ if (len == 0) {
+ /* base64_decode doesn't like NULL argument */
+ return DROPBEAR_FAILURE;
+ }
decodekeylen = len * 2; /* big to be safe */
decodekey = buf_new(decodekeylen);
--
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