Ensure a pointer is valid within map_readfromcache() before attempting to access its members.

git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@14401 54d463be-8e91-2dee-dedb-b68131a5f0ec

Changelog-Trunk.txt

@@ -3,6 +3,8 @@ Date	Added
 AS OF SVN REV. 5091, WE ARE NOW USING TRUNK.  ALL UNTESTED BUGFIXES/FEATURES GO INTO TRUNK.
 IF YOU HAVE A WORKING AND TESTED BUGFIX PUT IT INTO STABLE AS WELL AS TRUNK.
 
+2010/09/07
+	* Ensure a pointer is valid within map_readfromcache() before attempting to access its members. [Paradox924X]
 2010/09/06
 	* Rev. 14400 Implemented Icescope's fix for devotion, reflect damage is no longer absorbed by the devoter. (bugreport:3189) [L0ne_W0lf]
 	* As a folow up to r14301, increased MAX_REG_NUM to 256, to prevent possible data loss.

src/map/map.c

@@ -2719,7 +2719,7 @@ int map_readfromcache(struct map_data *m, char *buffer, char *decode_buffer)
 		p += sizeof(struct map_cache_map_info) + info->len;
 	}
 
-	if( i < header->map_count ) {
+	if( info && i < header->map_count ) {
 		unsigned long size, xy;
 
 		if( info->xs <= 0 || info->ys <= 0 )