From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 1/4] avcodec/tiff: Ignore tile_count
Date: Fri, 18 Nov 2022 22:09:15 +0100
Message-ID: <20221118210918.3169-1-michael@niedermayer.cc> (raw)
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 <michael@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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next reply other threads:[~2022-11-18 21:09 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-18 21:09 Michael Niedermayer [this message]
2022-11-18 21:09 ` [FFmpeg-devel] [PATCH 2/4] avformat/id3v2: Check taglen in read_uslt() Michael Niedermayer
2022-11-28 19:47 ` Michael Niedermayer
2022-11-18 21:09 ` [FFmpeg-devel] [PATCH 3/4] avcodec/mobiclip: Check input size before (re)allocation Michael Niedermayer
2022-11-19 2:34 ` Shiyou Yin
2022-11-28 19:46 ` Michael Niedermayer
2022-11-18 21:09 ` [FFmpeg-devel] [PATCH 4/4] avcodec/vqcdec: Check for end of input in decode_vectors() Michael Niedermayer
2022-11-18 23:03 ` Peter Ross
2022-11-19 20:04 ` Michael Niedermayer
2022-11-19 12:40 ` [FFmpeg-devel] [PATCH 1/4] avcodec/tiff: Ignore tile_count Anton Khirnov
2022-11-19 19:49 ` Michael Niedermayer
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