[FFmpeg-cvslog] truemotion2: error out if the huffman tree has no nodes.

[Ronald S. Bultje]

ffmpeg | branch: release/0.8 | Ronald S. Bultje <rsbultje at gmail.com> | Wed Feb 22 12:19:52 2012 -0800| [18b2f23ef83cf317fcf0de6035878407ba68829c] | committer: Reinhard Tartler

truemotion2: error out if the huffman tree has no nodes.

This prevents crashers and errors further down when reading nodes in the
empty tree.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable at libav.org
(cherry picked from commit 2b83e8b7005d531bc78b0fd4f699e9faa54ce9bb)

Signed-off-by: Anton Khirnov <anton at khirnov.net>
Signed-off-by: Reinhard Tartler <siretart at tauware.de>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=18b2f23ef83cf317fcf0de6035878407ba68829c
---

 libavcodec/truemotion2.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/libavcodec/truemotion2.c b/libavcodec/truemotion2.c
index 23abade..6ca9733 100644
--- a/libavcodec/truemotion2.c
+++ b/libavcodec/truemotion2.c
@@ -132,7 +132,7 @@ static int tm2_build_huff_table(TM2Context *ctx, TM2Codes *code)
                huff.val_bits, huff.max_bits);
         return -1;
     }
-    if((huff.nodes < 0) || (huff.nodes > 0x10000)) {
+    if((huff.nodes <= 0) || (huff.nodes > 0x10000)) {
         av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of Huffman tree nodes: %i\n", huff.nodes);
         return -1;
     }