avcodec/tiff: do not abort decoding if strips are available

Even if such files are invalid, they can be decoded just fine.
Also stored tiles may have bigger dimensions than displayed ones,
so do not abort decoding in such cases.

libavcodec/tiff.c

@@ -929,8 +929,8 @@ static int dng_decode_jpeg(AVCodecContext *avctx, AVFrame *frame,
         s->avctx_mjpeg->height == h / 2 &&
         s->avctx_mjpeg->pix_fmt == AV_PIX_FMT_GRAY16LE) {
         is_single_comp = 1;
-    } else if (s->avctx_mjpeg->width  == w &&
-               s->avctx_mjpeg->height == h &&
+    } else if (s->avctx_mjpeg->width  >= w &&
+               s->avctx_mjpeg->height >= h &&
                s->avctx_mjpeg->pix_fmt == (is_u16 ? AV_PIX_FMT_GRAY16 : AV_PIX_FMT_GRAY8)
               ) {
         is_single_comp = 0;
@@ -1923,8 +1923,7 @@ again:
     has_strip_bits = s->strippos || s->strips || s->stripoff || s->rps || s->sot || s->sstype || s->stripsize || s->stripsizesoff;
 
     if (has_tile_bits && has_strip_bits) {
-        av_log(avctx, AV_LOG_ERROR, "Tiled TIFF is not allowed to strip\n");
-        return AVERROR_INVALIDDATA;
+        av_log(avctx, AV_LOG_WARNING, "Tiled TIFF is not allowed to strip\n");
     }
 
     /* now we have the data and may start decoding */