fix: buffer overflow in multipart body proc

Author: airween

src/request_body_processor/multipart.cc

@@ -362,7 +362,7 @@ int Multipart::parse_content_disposition(const char *c_d_value, int offset) {
             const char* start_of_filename = p;
             while ((*p != '\0') && (*p != ';')) {
                 if (*p == '%') {
-                    if ((*(p+1) == '\0') || (!isxdigit(*(p+1))) || (!isxdigit(*(p+2)))) {
+                    if ((*(p+1) == '\0') || (!isxdigit(*(p+1))) || (*(p+2) == '\0') || (!isxdigit(*(p+2)))) {
                         return -18;
                     }
                     p += 3;
@@ -415,7 +415,9 @@ int Multipart::parse_content_disposition(const char *c_d_value, int offset) {
                 value.append((p++), 1);
             }
 
-            p++; /* go over the quote at the end */
+            if (*p == quote) {
+                p++; /* go over the quote at the end */
+            }
 
         } else {
             /* not quoted */