dvdsubdec: validate offset2 similar to offset1

If it is negative, it causes segmentation faults in decode_rle.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

diff --git a/libavcodec/dvdsubdec.c b/libavcodec/dvdsubdec.c
index ee06d55117fd955637eaa2263f9226dd13031af7..014b0a3a8341d2804912847e3ca10327a566b06e 100644 (file)
--- a/libavcodec/dvdsubdec.c
+++ b/libavcodec/dvdsubdec.c
@@ -353,7 +353,7 @@ static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,
             }
         }
     the_end:
-        if (offset1 >= 0) {
+        if (offset1 >= 0 && offset2 >= 0) {
             int w, h;
             uint8_t *bitmap;