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Abort if command offset decreases, avoids potential endless loop.

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Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
This commit is contained in:
Reimar Döffinger
2011-08-03 20:09:53 +02:00
parent 1816addc4e
commit 99c7b51641
1 changed files with 4 additions and 0 deletions
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4
libavcodec/dvdsubdec.c
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@@ -344,6 +344,10 @@ static int decode_dvd_subtitles(AVSubtitle *sub_header,
sub_header->rects[0]->pict.linesize[0] = w; sub_header->rects[0]->pict.linesize[0] = w;
} }
} }
if (next_cmd_pos < cmd_pos) {
av_log(NULL, AV_LOG_ERROR, "Invalid command offset\n");
break;
}
if (next_cmd_pos == cmd_pos) if (next_cmd_pos == cmd_pos)
break; break;
cmd_pos = next_cmd_pos; cmd_pos = next_cmd_pos;