From 05b85ebe7ffcfe41f084b6f46ab49a4f21c0eb22 Mon Sep 17 00:00:00 2001
From: Daniel Melani <daniel.melani@gmail.com>
Date: Thu, 29 May 2014 16:05:27 +0200
Subject: [PATCH 1/2] Less surprising behaviour.

Make redisFree() and freeReplyObject() less surprising by behaving just
like free(). That is, don't crash when passing in NULL.
---
 hiredis.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hiredis.c b/hiredis.c
index 2afee56..78beaae 100644
--- a/hiredis.c
+++ b/hiredis.c
@@ -73,6 +73,9 @@ void freeReplyObject(void *reply) {
     redisReply *r = reply;
     size_t j;
 
+    if (r == NULL)
+        return;
+
     switch(r->type) {
     case REDIS_REPLY_INTEGER:
         break; /* Nothing to free */
@@ -1001,6 +1004,8 @@ static redisContext *redisContextInit(void) {
 }
 
 void redisFree(redisContext *c) {
+    if (c == NULL)
+        return;
     if (c->fd > 0)
         close(c->fd);
     if (c->obuf != NULL)

From 21a1207ae13f3d422fb99669019836da3422b784 Mon Sep 17 00:00:00 2001
From: Daniel Melani <daniel.melani@gmail.com>
Date: Thu, 29 May 2014 17:10:03 +0200
Subject: [PATCH 2/2] Add tests for redisFree() and freeReplyObject()

Test that redisFree() and freeReplyObject() do not crash when NULL is
passed in.
---
 test.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/test.c b/test.c
index 713cc06..93116bd 100644
--- a/test.c
+++ b/test.c
@@ -318,6 +318,19 @@ static void test_reply_reader(void) {
     redisReaderFree(reader);
 }
 
+static void test_free_null(void) {
+    void *redisContext = NULL;
+    void *reply = NULL;
+
+    test("Don't fail when redisFree is passed a NULL value: ");
+    redisFree(redisContext);
+    test_cond(redisContext == NULL);
+
+    test("Don't fail when freeReplyObject is passed a NULL value: ");
+    freeReplyObject(reply);
+    test_cond(reply == NULL);
+}
+
 static void test_blocking_connection_errors(void) {
     redisContext *c;
 
@@ -702,6 +715,7 @@ int main(int argc, char **argv) {
     test_format_commands();
     test_reply_reader();
     test_blocking_connection_errors();
+    test_free_null();
 
     printf("\nTesting against TCP connection (%s:%d):\n", cfg.tcp.host, cfg.tcp.port);
     cfg.type = CONN_TCP;
@@ -723,6 +737,7 @@ int main(int argc, char **argv) {
         test_blocking_connection(cfg);
     }
 
+
     if (fails) {
         printf("*** %d TESTS FAILED ***\n", fails);
         return 1;