From 6e98cf0280cd693ef82c4444fe15bc7aef8771b3 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sun, 16 Apr 2023 17:38:39 +0200 Subject: [PATCH] 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 --- libavcodec/tiff.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavcodec/tiff.c b/libavcodec/tiff.c index 560cb3e5b3..148964590b 100644 --- a/libavcodec/tiff.c +++ b/libavcodec/tiff.c @@ -1451,7 +1451,7 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame) break; case TIFF_GRAY_RESPONSE_CURVE: 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);