[FFmpeg-devel] [PATCH 1/4] avcodec/vp3: Check for end of input in 2 places of vp4_unpack_macroblocks()
Michael Niedermayer
michael at niedermayer.cc
Mon Sep 2 00:10:25 EEST 2019
Fixes: Timeout (82sec -> 1sec)
Fixes: 16411/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VP3_fuzzer-5166958151991296
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/vp3.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c
index 28ed0461c7..a2bd2ef07d 100644
--- a/libavcodec/vp3.c
+++ b/libavcodec/vp3.c
@@ -710,6 +710,8 @@ static int vp4_unpack_macroblocks(Vp3DecodeContext *s, GetBitContext *gb)
has_partial = 0;
bit = get_bits1(gb);
for (i = 0; i < s->yuv_macroblock_count; i += current_run) {
+ if (get_bits_left(gb) <= 0)
+ return AVERROR_INVALIDDATA;
current_run = vp4_get_mb_count(s, gb);
if (current_run > s->yuv_macroblock_count - i)
return -1;
@@ -719,6 +721,8 @@ static int vp4_unpack_macroblocks(Vp3DecodeContext *s, GetBitContext *gb)
}
if (has_partial) {
+ if (get_bits_left(gb) <= 0)
+ return AVERROR_INVALIDDATA;
bit = get_bits1(gb);
current_run = vp4_get_mb_count(s, gb);
for (i = 0; i < s->yuv_macroblock_count; i++) {
--
2.23.0
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