From 33b77673cbf634accd9730963de46147c75ff1a5 Mon Sep 17 00:00:00 2001
From: Rinat Ibragimov <ibragimovrinat@mail.ru>
Date: Wed, 29 Apr 2015 21:27:41 +0300
Subject: [PATCH] check if ftell() returns -1

---
 parson.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/parson.c b/parson.c
index 83a21ff..587e8c8 100644
--- a/parson.c
+++ b/parson.c
@@ -179,11 +179,17 @@ static size_t parson_strlen(const char *string) {
 static char * read_file(const char * filename) {
     FILE *fp = fopen(filename, "r");
     size_t file_size;
+    long pos;
     char *file_contents;
     if (!fp)
         return NULL;
     fseek(fp, 0L, SEEK_END);
-    file_size = ftell(fp);
+    pos = ftell(fp);
+    if (pos < 0) {
+        fclose(fp);
+        return NULL;
+    }
+    file_size = pos;
     rewind(fp);
     file_contents = (char*)PARSON_MALLOC(sizeof(char) * (file_size + 1));
     if (!file_contents) {