[FFmpeg-devel] [PATCH 4/4] avcodec/jpeg2000dec: Check that atom header is within bytsetream
Michael Niedermayer
michael at niedermayer.cc
Sun Sep 5 22:24:18 EEST 2021
Fixes: Infinite loop
Fixes: 36666/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_fuzzer-5912760671141888
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
libavcodec/jpeg2000dec.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index e62f7b19e6..c95f22bc90 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -2360,6 +2360,8 @@ static int jp2_find_codestream(Jpeg2000DecoderContext *s)
atom_size >= 16) {
uint32_t atom2_size, atom2, atom2_end;
do {
+ if (bytestream2_get_bytes_left(&s->g) < 8)
+ break;
atom2_size = bytestream2_get_be32u(&s->g);
atom2 = bytestream2_get_be32u(&s->g);
atom2_end = bytestream2_tell(&s->g) + atom2_size - 8;
--
2.17.1
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