[FFmpeg-devel] [PATCH 4/4] avcodec/jpeg2000dec: Check PLT data somewhat
Michael Niedermayer
michael at niedermayer.cc
Tue Apr 16 17:48:34 EEST 2019
Fixes: Timeout (21sec -> 0.6sec)
Fixes: 14134/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_fuzzer-5768371078955008
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 | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index 9198cf87cb..62b0b1f9b7 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -832,15 +832,21 @@ static uint8_t get_tlm(Jpeg2000DecoderContext *s, int n)
static uint8_t get_plt(Jpeg2000DecoderContext *s, int n)
{
int i;
+ int v;
av_log(s->avctx, AV_LOG_DEBUG,
"PLT marker at pos 0x%X\n", bytestream2_tell(&s->g) - 4);
+ if (n < 4)
+ return AVERROR_INVALIDDATA;
+
/*Zplt =*/ bytestream2_get_byte(&s->g);
for (i = 0; i < n - 3; i++) {
- bytestream2_get_byte(&s->g);
+ v = bytestream2_get_byte(&s->g);
}
+ if (v & 0x80)
+ return AVERROR_INVALIDDATA;
return 0;
}
--
2.21.0
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