[FFmpeg-devel] [PATCH v2] avcodec/mv30: Check the input length before allocation

[Michael Niedermayer <michael@niedermayer.cc>]

Fixes: Timeout
Fixes: 60867/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MV30_fuzzer-6381933108527104
Fixes: 30147/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MV30_fuzzer-5549246684200960

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/mv30.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavcodec/mv30.c b/libavcodec/mv30.c
index 0b19534b00..addf188c92 100644
--- a/libavcodec/mv30.c
+++ b/libavcodec/mv30.c
@@ -411,6 +411,8 @@ static int decode_intra(AVCodecContext *avctx, GetBitContext *gb, AVFrame *frame
     mgb = *gb;
     if (get_bits_left(gb) < s->mode_size * 8)
         return AVERROR_INVALIDDATA;
+    if (s->mode_size * 8 < (avctx->height + 15)/16 * ((avctx->width + 15)/16) * 12)
+        return AVERROR_INVALIDDATA;
 
     skip_bits_long(gb, s->mode_size * 8);
 
@@ -476,6 +478,9 @@ static int decode_inter(AVCodecContext *avctx, GetBitContext *gb,
     int ret, cnt = 0;
     int flags = 0;
 
+    if (get_bits_left(gb) < (mask_size + s->mode_size) * 8)
+        return AVERROR_INVALIDDATA;
+
     if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
         return ret;
 
-- 
2.17.1

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