[FFmpeg-devel] [PATCH]lavc/mjpegdec: Do not overread too short JFIF tag

[Carl Eugen Hoyos]

Hi!

Attached patch fixes ticket #6055 for me.

Please comment, Carl Eugen
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From 3a9e911de8c5a4cf7748fa814e66b2e775778bfa Mon Sep 17 00:00:00 2001
From: Carl Eugen Hoyos <cehoyos at ag.or.at>
Date: Sun, 1 Jan 2017 14:19:48 +0100
Subject: [PATCH] lavc/mjpegdec: Do not overread too short JFIF tags.

Fixes ticket #6055.
---
 libavcodec/mjpegdec.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index eee8d58..e0b22ec 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -1670,6 +1670,8 @@ static int mjpeg_decode_app(MJpegDecodeContext *s)
 
     if (id == AV_RB32("JFIF")) {
         int t_w, t_h, v1, v2;
+        if (len < 8)
+            goto out;
         skip_bits(&s->gb, 8); /* the trailing zero-byte */
         v1 = get_bits(&s->gb, 8);
         v2 = get_bits(&s->gb, 8);
-- 
1.7.10.4