avcodec/exr: Check xdelta, ydelta

Fixes: assertion failure
Fixes: 25617/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EXR_fuzzer-5648746061496320

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/exr.c

@@ -1751,7 +1751,8 @@ static int decode_frame(AVCodecContext *avctx, void *data,
 
     /* Verify the xmin, xmax, ymin and ymax before setting the actual image size.
      * It's possible for the data window can larger or outside the display window */
-    if (s->xmin > s->xmax  || s->ymin > s->ymax) {
+    if (s->xmin > s->xmax  || s->ymin > s->ymax ||
+        s->ydelta == 0xFFFFFFFF || s->xdelta == 0xFFFFFFFF) {
         av_log(avctx, AV_LOG_ERROR, "Wrong or missing size information.\n");
         return AVERROR_INVALIDDATA;
     }