From 1620f552a277ed5b23a48b9c27dbf07663cac068 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <[email protected]>
Date: Tue, 27 Sep 2016 17:36:19 +0200
Subject: [PATCH] cookie: replace use of fgets() with custom version

... that will ignore lines that are too long to fit in the buffer.

CVE-2016-8615

Bug: https://curl.haxx.se/docs/adv_20161102A.html
Reported-by: Cure53
---
 lib/cookie.c | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

--- lib/cookie.c
+++ lib/cookie.c
@@ -901,10 +901,39 @@ Curl_cookie_add(struct Curl_easy *data,
   }
 
   return co;
 }
 
+/*
+ * get_line() makes sure to only return complete whole lines that fit in 'len'
+ * bytes and end with a newline.
+ */
+static char *get_line(char *buf, int len, FILE *input)
+{
+  bool partial = FALSE;
+  while(1) {
+    char *b = fgets(buf, len, input);
+    if(b) {
+      size_t rlen = strlen(b);
+      if(rlen && (b[rlen-1] == '\n')) {
+        if(partial) {
+          partial = FALSE;
+          continue;
+        }
+        return b;
+      }
+      else
+        /* read a partial, discard the next piece that ends with newline */
+        partial = TRUE;
+    }
+    else
+      break;
+  }
+  return NULL;
+}
+
+
 /*****************************************************************************
  *
  * Curl_cookie_init()
  *
  * Inits a cookie struct to read data from a local file. This is always
@@ -957,11 +986,11 @@ struct CookieInfo *Curl_cookie_init(struct Curl_easy *data,
     bool headerline;
 
     line = malloc(MAX_COOKIE_LINE);
     if(!line)
       goto fail;
-    while(fgets(line, MAX_COOKIE_LINE, fp)) {
+    while(get_line(line, MAX_COOKIE_LINE, fp)) {
       if(checkprefix("Set-Cookie:", line)) {
         /* This is a cookie line, get it! */
         lineptr=&line[11];
         headerline=TRUE;
       }
-- 
2.9.3