@@ -552,6 +552,11 @@ static int mss4_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
"Empty frame found but it is not a skip frame.\n");
return AVERROR_INVALIDDATA;
}
+ mb_width = FFALIGN(width, 16) >> 4;
+ mb_height = FFALIGN(height, 16) >> 4;
+
+ if (frame_type != SKIP_FRAME && 8*buf_size < 8*HEADER_SIZE + mb_width*mb_height)
+ return AVERROR_INVALIDDATA;
if ((ret = ff_reget_buffer(avctx, c->pic)) < 0)
return ret;
@@ -574,9 +579,6 @@ static int mss4_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
if ((ret = init_get_bits8(&gb, buf + HEADER_SIZE, buf_size - HEADER_SIZE)) < 0)
return ret;
-
- mb_width = FFALIGN(width, 16) >> 4;
- mb_height = FFALIGN(height, 16) >> 4;
dst[0] = c->pic->data[0];
dst[1] = c->pic->data[1];
dst[2] = c->pic->data[2];
Fixes: Timeout (17sec -> 20ms) Fixes: 14615/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MTS2_fuzzer-5093007763701760 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc> --- libavcodec/mss4.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)