[FFmpeg-devel] [PATCH] avcodec/dvdsubdec: Fix off by 1 error

[Michael Niedermayer]

Fixes out of array read

Found-by: Thomas Garnier using libFuzzer
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavcodec/dvdsubdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/dvdsubdec.c b/libavcodec/dvdsubdec.c
index b81b481..18475ec 100644
--- a/libavcodec/dvdsubdec.c
+++ b/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;
-- 
2.10.1