dfa: check for invalid access in decode_wdlt().

This can happen when the number of skipped lines is not consistent with
the number of coded lines.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
(cherry picked from commit 3623589edc7b1257bb45aa9e52c9631e133f22b6)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>

libavcodec/dfa.c

@@ -263,6 +263,8 @@ static int decode_wdlt(uint8_t *frame, int width, int height,
             segments = bytestream_get_le16(&src);
         }
         line_ptr = frame;
+        if (frame_end - frame < width)
+            return AVERROR_INVALIDDATA;
         frame += width;
         y++;
         while (segments--) {