From 76112c2b4167bb3c40503b3334c8b38fd707a8d5 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Thu, 21 Jul 2022 23:27:59 +0200 Subject: [PATCH] avcodec/tiff: Check tile_length and tile_width Fixes: Division by 0 Fixes: 49235/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-5495613847896064 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavcodec/tiff.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/libavcodec/tiff.c b/libavcodec/tiff.c index 349df14035..329eafe494 100644 --- a/libavcodec/tiff.c +++ b/libavcodec/tiff.c @@ -965,6 +965,9 @@ static int dng_decode_tiles(AVCodecContext *avctx, AVFrame *frame, int pos_x = 0, pos_y = 0; int ret; + if (s->tile_width <= 0 || s->tile_length <= 0) + return AVERROR_INVALIDDATA; + has_width_leftover = (s->width % s->tile_width != 0); has_height_leftover = (s->height % s->tile_length != 0);