From 2deda9906480f9c8ae07b8c2a5510cc7e4c59a8e Mon Sep 17 00:00:00 2001
From: Alan Coopersmith <alan.coopersmith@oracle.com>
Date: Fri, 6 Feb 2015 15:50:45 -0800
Subject: bdfReadProperties: property count needs range check [CVE-2015-1802]

Avoid integer overflow or underflow when allocating memory arrays
by multiplying the number of properties reported for a BDF font.

Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Julien Cristau <jcristau@debian.org>

diff --git a/src/bitmap/bdfread.c b/src/bitmap/bdfread.c
index 914a024..6387908 100644
--- a/src/bitmap/bdfread.c
+++ b/src/bitmap/bdfread.c
@@ -604,7 +604,9 @@ bdfReadProperties(FontFilePtr file, FontPtr pFont, bdfFileState *pState)
 	bdfError("missing 'STARTPROPERTIES'\n");
 	return (FALSE);
     }
-    if (sscanf((char *) line, "STARTPROPERTIES %d", &nProps) != 1) {
+    if ((sscanf((char *) line, "STARTPROPERTIES %d", &nProps) != 1) ||
+	(nProps <= 0) ||
+	(nProps > ((INT32_MAX / sizeof(FontPropRec)) - BDF_GENPROPS))) {
 	bdfError("bad 'STARTPROPERTIES'\n");
 	return (FALSE);
     }
-- 
cgit v0.10.2

