From 7da629c2abc50b798dbb25c2badd0e98ee702f79 Mon Sep 17 00:00:00 2001
From: jacob <jacob@cda61777-01e9-0310-a592-d414129be87e>
Date: Tue, 13 Mar 2007 14:43:14 +0000
Subject: [PATCH] get_random_data() can return NULL (for instance, if we can't
 open /dev/random on Unix), yet cmdgen failed to deal with this. Spotted by
 Darren Tucker.

git-svn-id: svn://svn.tartarus.org/sgt/putty@7396 cda61777-01e9-0310-a592-d414129be87e
---
 cmdgen.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/cmdgen.c b/cmdgen.c
index d8d5a946..9aa585f3 100644
--- a/cmdgen.c
+++ b/cmdgen.c
@@ -640,6 +640,11 @@ int main(int argc, char **argv)
 
 	random_ref();
 	entropy = get_random_data(bits / 8);
+	if (!entropy) {
+	    fprintf(stderr, "puttygen: failed to collect entropy, "
+		    "could not generate key\n");
+	    return 1;
+	}
 	random_add_heavynoise(entropy, bits / 8);
 	memset(entropy, 0, bits/8);
 	sfree(entropy);
-- 
2.11.0