Merge pull request #6812 from guybe7/str_convert_fix

ld2string should fail if string contains \0 in the middle

src/module.c

@@ -3901,7 +3901,7 @@ void RM_SaveLongDouble(RedisModuleIO *io, long double value) {
     /* Long double has different number of bits in different platforms, so we
      * save it as a string type. */
     size_t len = ld2string(buf,sizeof(buf),value,LD_STR_HEX);
-    RM_SaveStringBuffer(io,buf,len+1); /* len+1 for '\0' */
+    RM_SaveStringBuffer(io,buf,len);
 }
 
 /* In the context of the rdb_save method of a module data type, loads back the

src/object.c

@@ -640,21 +640,13 @@ int getDoubleFromObjectOrReply(client *c, robj *o, double *target, const char *m
 
 int getLongDoubleFromObject(robj *o, long double *target) {
     long double value;
-    char *eptr;
 
     if (o == NULL) {
         value = 0;
     } else {
         serverAssertWithInfo(NULL,o,o->type == OBJ_STRING);
         if (sdsEncodedObject(o)) {
-            errno = 0;
-            value = strtold(o->ptr, &eptr);
-            if (sdslen(o->ptr) == 0 ||
-                isspace(((const char*)o->ptr)[0]) ||
-                (size_t)(eptr-(char*)o->ptr) != sdslen(o->ptr) ||
-                (errno == ERANGE &&
-                    (value == HUGE_VAL || value == -HUGE_VAL || value == 0)) ||
-                isnan(value))
+            if (!string2ld(o->ptr, sdslen(o->ptr), &value))
                 return C_ERR;
         } else if (o->encoding == OBJ_ENCODING_INT) {
             value = (long)o->ptr;

src/util.c

@@ -471,13 +471,14 @@ int string2ld(const char *s, size_t slen, long double *dp) {
     long double value;
     char *eptr;
 
-    if (slen >= sizeof(buf)) return 0;
+    if (slen == 0 || slen >= sizeof(buf)) return 0;
     memcpy(buf,s,slen);
     buf[slen] = '\0';
 
     errno = 0;
     value = strtold(buf, &eptr);
     if (isspace(buf[0]) || eptr[0] != '\0' ||
+        (size_t)(eptr-buf) != slen ||
         (errno == ERANGE &&
             (value == HUGE_VAL || value == -HUGE_VAL || value == 0)) ||
         errno == EINVAL ||