From 7d3c1bea895d910907e2501fe9165e353eceabae Mon Sep 17 00:00:00 2001
From: Markus Kuhn <Markus.Kuhn@cl.cam.ac.uk>
Date: Mon, 15 Feb 2021 18:27:47 +0000
Subject: [PATCH 15/15] jbg_newlen(): check for end-of-file within
 MARKER_NEWLEN

fixes https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=969593
reported by Casper Sun
---
 libjbig/jbig.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libjbig/jbig.c b/libjbig/jbig.c
index e9938e5..289b6d8 100644
--- a/libjbig/jbig.c
+++ b/libjbig/jbig.c
@@ -3272,6 +3272,8 @@ int jbg_newlen(unsigned char *bie, size_t len)
     else if (p[0] == MARKER_ESC)
       switch (p[1]) {
       case MARKER_NEWLEN:
+        if (p + 5 >= bie + len)
+          return JBG_EAGAIN;
 	y = (((long) bie[ 8] << 24) | ((long) bie[ 9] << 16) |
 	     ((long) bie[10] <<  8) |  (long) bie[11]);
 	yn = (((long) p[2] << 24) | ((long) p[3] << 16) |
-- 
2.45.0

