From 52334f5be2ef31a5c836f689f3ab95b25bad026a Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Thu, 3 Jan 2013 04:25:55 +0100
Subject: [PATCH] tiff: print error for old style LZW

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavcodec/tiff.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/tiff.c b/libavcodec/tiff.c
index e92967d01e..f70009785f 100644
--- a/libavcodec/tiff.c
+++ b/libavcodec/tiff.c
@@ -462,6 +462,9 @@ static int tiff_unpack_strip(TiffContext *s, uint8_t *dst, int stride,
             src = s->deinvert_buf;
             ssrc = src;
         }
+        if (size > 1 && !src[0] && (src[1]&1)) {
+            av_log(s->avctx, AV_LOG_ERROR, "Old style LZW is unsupported\n");
+        }
         if (ff_lzw_decode_init(s->lzw, 8, src, size, FF_LZW_TIFF) < 0) {
             av_log(s->avctx, AV_LOG_ERROR, "Error initializing LZW decoder\n");
             return -1;