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

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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@libav.org
(cherry picked from commit 2b83e8b7005d531bc78b0fd4f699e9faa54ce9bb)

Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Ronald S. Bultje 2012-02-22 12:19:52 -08:00 committed by Reinhard Tartler
parent 0312969b9e
commit 8e3dc37bc0
1 changed files with 1 additions and 1 deletions
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2
libavcodec/truemotion2.c
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@ -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;
}