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avcodec/dvdsubdec: Fix off by 1 error

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Fixes out of array read

Found-by: Thomas Garnier using libFuzzer
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2016-10-26 00:11:52 +02:00
parent e936c8d176
commit c92f55847a
1 changed files with 1 additions and 1 deletions
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2
libavcodec/dvdsubdec.c
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@ -185,7 +185,7 @@ static void guess_palette(DVDSubContext* ctx,
for(i = 0; i < 4; i++) {
if (alpha[i] != 0) {
if (!color_used[colormap[i]]) {
level = level_map[nb_opaque_colors][j];
level = level_map[nb_opaque_colors - 1][j];
r = (((subtitle_color >> 16) & 0xff) * level) >> 8;
g = (((subtitle_color >> 8) & 0xff) * level) >> 8;
b = (((subtitle_color >> 0) & 0xff) * level) >> 8;