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Fix nodes[nb_codes*2-1].count being uninitialized and used to initialize

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nodes[nb_codes*2-2].count (thus making that invalid as well) in
ff_huff_build_tree.
Might fix some (hard to reproduce) crashes in VP6 decoder.

Originally committed as revision 11119 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2007-12-01 09:39:59 +00:00
parent 5d702d6db2
commit 892a4c2da8
1 changed files with 1 additions and 0 deletions
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1
libavcodec/huffman.c
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@ -82,6 +82,7 @@ int ff_huff_build_tree(AVCodecContext *avctx, VLC *vlc, int nb_codes,
} }
qsort(nodes, nb_codes, sizeof(Node), cmp); qsort(nodes, nb_codes, sizeof(Node), cmp);
cur_node = nb_codes; cur_node = nb_codes;
nodes[nb_codes*2-1].count = 0;
for(i = 0; i < nb_codes*2-1; i += 2){ for(i = 0; i < nb_codes*2-1; i += 2){
nodes[cur_node].sym = HNODE; nodes[cur_node].sym = HNODE;
nodes[cur_node].count = nodes[i].count + nodes[i+1].count; nodes[cur_node].count = nodes[i].count + nodes[i+1].count;