From 1b33867fa996034deb50819ae54640be501f8d20 Mon Sep 17 00:00:00 2001
From: Alan Coopersmith <alan.coopersmith@oracle.com>
Date: Wed, 1 May 2013 17:59:31 -0700
Subject: [PATCH] integer overflow in read_packet() [CVE-2013-2064]

Ensure that when calculating the size of the incoming response from the
Xserver, we don't overflow the integer used in the calculations when we
multiply the int32_t length by 4 and add it to the default response size.

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
---
 src/xcb_in.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/xcb_in.c b/src/xcb_in.c
index b810783..8a7af92 100644
--- a/src/xcb_in.c
+++ b/src/xcb_in.c
@@ -93,8 +93,9 @@ static void remove_finished_readers(reader_list **prev_reader, uint64_t complete
 static int read_packet(xcb_connection_t *c)
 {
     xcb_generic_reply_t genrep;
-    int length = 32;
-    int eventlength = 0; /* length after first 32 bytes for GenericEvents */
+    uint64_t length = 32;
+    uint64_t eventlength = 0; /* length after first 32 bytes for GenericEvents */
+    uint64_t bufsize;
     void *buf;
     pending_reply *pend = 0;
     struct event_list *event;
@@ -169,8 +170,12 @@ static int read_packet(xcb_connection_t *c)
     if ((genrep.response_type & 0x7f) == XCB_XGE_EVENT)
         eventlength = genrep.length * 4;
 
-    buf = malloc(length + eventlength +
-            (genrep.response_type == XCB_REPLY ? 0 : sizeof(uint32_t)));
+    bufsize = length + eventlength +
+        (genrep.response_type == XCB_REPLY ? 0 : sizeof(uint32_t));
+    if (bufsize < INT32_MAX)
+        buf = malloc((size_t) bufsize);
+    else
+        buf = NULL;
     if(!buf)
     {
         _xcb_conn_shutdown(c, XCB_CONN_CLOSED_MEM_INSUFFICIENT);
-- 
1.8.1.4