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avcodec/dvdsubdec: Fix off by 1 error

Fixes out of array read

Found-by: Thomas Garnier using libFuzzer
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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1 parent e936c8d commit c92f55847a3d9cd12db60bfcd0831ff7f089c37c Michael Niedermayer committed Oct 25, 2016
Showing with 1 addition and 1 deletion.
  1. +1 −1 libavcodec/dvdsubdec.c
@@ -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;

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