Fixes: out of array access
Fixes: 
23589/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-5110559589793792.fuzz

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 | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libavcodec/tiff.c b/libavcodec/tiff.c
index dc24d055ec..d93a02b07e 100644
--- a/libavcodec/tiff.c
+++ b/libavcodec/tiff.c
@@ -859,8 +859,11 @@ static void dng_blit(TiffContext *s, uint8_t *dst, int 
dst_stride,
             }
         } else {
             for (line = 0; line < height; line++) {
+                uint8_t *dst_u8 = dst;
+                const uint8_t *src_u8 = src;
+
                 for (col = 0; col < width; col++)
-                    *dst++ = dng_process_color8(*src++, s->dng_lut, 
s->black_level, scale_factor);
+                    *dst_u8++ = dng_process_color8(*src_u8++, s->dng_lut, 
s->black_level, scale_factor);
 
                 dst += dst_stride;
                 src += src_stride;
-- 
2.17.1

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