From 698e042c77ecb5b0d616de254adc783e8b61b9c4 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Wed, 23 Oct 2019 20:57:12 +0200 Subject: [PATCH] avcodec/vp5: Check render_x/y Fixes: Timeout (15sec -> 91ms) Fixes: 18353/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VP5_fuzzer-5704150326706176 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Reviewed-by: Peter Ross Signed-off-by: Michael Niedermayer --- libavcodec/vp5.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/libavcodec/vp5.c b/libavcodec/vp5.c index 0fca282918..f3946f508c 100644 --- a/libavcodec/vp5.c +++ b/libavcodec/vp5.c @@ -48,6 +48,8 @@ static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size) ff_vp56_init_dequant(s, vp56_rac_gets(c, 6)); if (s->frames[VP56_FRAME_CURRENT]->key_frame) { + int render_x, render_y; + vp56_rac_gets(c, 8); if(vp56_rac_gets(c, 5) > 5) return AVERROR_INVALIDDATA; @@ -63,8 +65,11 @@ static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size) cols << 4, rows << 4); return AVERROR_INVALIDDATA; } - vp56_rac_gets(c, 8); /* number of displayed macroblock rows */ - vp56_rac_gets(c, 8); /* number of displayed macroblock cols */ + render_y = vp56_rac_gets(c, 8); /* number of displayed macroblock rows */ + render_x = vp56_rac_gets(c, 8); /* number of displayed macroblock cols */ + if (render_x == 0 || render_x > cols || + render_y == 0 || render_y > rows) + return AVERROR_INVALIDDATA; vp56_rac_gets(c, 2); if (!s->macroblocks || /* first frame */ 16*cols != s->avctx->coded_width ||