Bug:An exception branch handling may cause a memory leak

[coolc4]

edrav2/eprj/curl/lib/escape.c

char *curl_easy_escape(struct Curl_easy *data, const char *string,
int inlength)
{
....

alloc = (inlength?(size_t)inlength:strlen(string)) + 1;
newlen = alloc;

//malloc the ns memery
ns = malloc(alloc);
if(!ns)
return NULL;
//malloc ok

length = alloc-1;
while(length--) {
unsigned char in = string; / we need to treat the characters unsigned */

if(Curl_isunreserved(in))
  /* just copy this */
  ns[strindex++] = in;
else {
  /* encode it */
  newlen += 2; /* the size grows with two, since this'll become a %XX */
  if(newlen > alloc) {
    alloc *= 2;
    testing_ptr = Curl_saferealloc(ns, alloc);
    if(!testing_ptr)
      return NULL;
      // Here  will cause the memery leak.
    
.....

}

[coolc4]

And I fixed the bug by th patch:
Uploading curl_escape_memleak_patch.txt…