diff --git a/libavcodec/dvdsubdec.c b/libavcodec/dvdsubdec.c
index 13d52c8c68..632a53adab 100644
--- a/libavcodec/dvdsubdec.c
+++ b/libavcodec/dvdsubdec.c
@@ -125,6 +125,8 @@ static int decode_rle(uint8_t *bitmap, int linesize, int w, int h, uint8_t used_
             len = decode_run_8bit(&gb, &color);
         else
             len = decode_run_2bit(&gb, &color);
+        if (len != INT_MAX && len > w - x)
+            return AVERROR_INVALIDDATA;
         len = FFMIN(len, w - x);
         memset(d + x, color, len);
         used_color[color] = 1;