enlarged buffer given to ld2string

src/object.c

@@ -145,7 +145,7 @@ robj *createStringObjectFromLongLong(long long value) {
  *
  * The 'humanfriendly' option is used for INCRBYFLOAT and HINCRBYFLOAT. */
 robj *createStringObjectFromLongDouble(long double value, int humanfriendly) {
-    char buf[256];
+    char buf[MAX_LONG_DOUBLE_CHARS];
     int len = ld2string(buf,sizeof(buf),value,humanfriendly);
     return createStringObject(buf,len);
 }

src/t_hash.c

@@ -616,7 +616,7 @@ void hincrbyfloatCommand(client *c) {
 
     value += incr;
 
-    char buf[256];
+    char buf[MAX_LONG_DOUBLE_CHARS];
     int len = ld2string(buf,sizeof(buf),value,1);
     new = sdsnewlen(buf,len);
     hashTypeSet(o,c->argv[2]->ptr,new,HASH_SET_TAKE_VALUE);

src/util.h

@@ -33,6 +33,11 @@
 #include <stdint.h>
 #include "sds.h"
 
+/* The maximum number of characters needed to represent a long double
+ * as a string (long double has a huge range).
+ * This should be the size of the buffer given to ld2string */
+#define MAX_LONG_DOUBLE_CHARS 5*1024
+
 int stringmatchlen(const char *p, int plen, const char *s, int slen, int nocase);
 int stringmatch(const char *p, const char *s, int nocase);
 long long memtoll(const char *p, int *err);