Fixes: out of array access
Fixes: 
52427/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-4849108968144896

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavcodec/tiff.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/tiff.c b/libavcodec/tiff.c
index cde318d5e5..b962dce5a2 100644
--- a/libavcodec/tiff.c
+++ b/libavcodec/tiff.c
@@ -994,7 +994,7 @@ static int dng_decode_tiles(AVCodecContext *avctx, AVFrame 
*frame,
     tile_count_y = (s->height + s->tile_length - 1) / s->tile_length;
 
     /* Iterate over the number of tiles */
-    for (tile_idx = 0; tile_idx < s->tile_count; tile_idx++) {
+    for (tile_idx = 0; tile_idx < tile_count_x * tile_count_y; tile_idx++) {
         tile_x = tile_idx % tile_count_x;
         tile_y = tile_idx / tile_count_x;
 
-- 
2.17.1

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