From 4a4e12a7adaddf6a8437ae9233aa393a9caf7257 Mon Sep 17 00:00:00 2001
From: Con Kolivas <kernel@kolivas.org>
Date: Sun, 19 Oct 2014 20:19:21 +1100
Subject: [PATCH] Fix nonce2 sanitisation

---
 src/stratifier.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/stratifier.c b/src/stratifier.c
index 0741fb6e..16246c9f 100644
--- a/src/stratifier.c
+++ b/src/stratifier.c
@@ -2231,10 +2231,13 @@ static json_t *parse_submit(stratum_instance_t *client, json_t *json_msg,
 	wdiff = wb->diff;
 	strcpy(idstring, wb->idstring);
 	ASPRINTF(&fname, "%s.sharelog", wb->logdir);
-	/* Fix broken clients sending too many chars */
+	/* Fix broken clients sending too many chars. Nonce2 is part of the
+	 * read only json so use a temporary variable and modify it. */
 	len = wb->enonce2varlen * 2;
-	if ((int)strlen(nonce2) > len)
+	if ((int)strlen(nonce2) > len) {
+		nonce2 = strdupa(nonce2);
 		nonce2[len] = '\0';
+	}
 	sdiff = submission_diff(client, wb, nonce2, ntime32, nonce, hash);
 	bswap_256(sharehash, hash);
 	__bin2hex(hexhash, sharehash, 32);