[FFmpeg-cvslog] avcodec/tiff: add a zero DNG_LINEARIZATION_TABLE check

[Michael Niedermayer]

ffmpeg | branch: release/4.4 | Michael Niedermayer <michael at niedermayer.cc> | Sun Apr 16 17:38:39 2023 +0200| [bdd27edf3e3834d090585dc74f05882d1e039422] | committer: Michael Niedermayer

avcodec/tiff: add a zero DNG_LINEARIZATION_TABLE check

Fixes: index 4294967295 out of bounds for type 'uint16_t [65536]'
Fixes: 45982/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-5950405086674944
Fixes: 45982/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-6666195176914944

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 6e98cf0280cd693ef82c4444fe15bc7aef8771b3)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=bdd27edf3e3834d090585dc74f05882d1e039422
---

 libavcodec/tiff.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/tiff.c b/libavcodec/tiff.c
index 05187dce51..ebbe8cdbd4 100644
--- a/libavcodec/tiff.c
+++ b/libavcodec/tiff.c
@@ -1428,7 +1428,7 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
             s->sub_ifd = ff_tget(&s->gb, TIFF_LONG, s->le); /** Only get the first SubIFD */
         break;
     case DNG_LINEARIZATION_TABLE:
-        if (count > FF_ARRAY_ELEMS(s->dng_lut))
+        if (count < 1 || count > FF_ARRAY_ELEMS(s->dng_lut))
             return AVERROR_INVALIDDATA;
         for (int i = 0; i < count; i++)
             s->dng_lut[i] = ff_tget(&s->gb, type, s->le);