From f857753f56f86046d454969e33ba85b3bac99be2 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Thu, 25 Apr 2019 19:18:08 +0200 Subject: [PATCH] avcodec/gdv: Check input palette size before rescale() Fixes: Timeout (22sec -> 11sec) Fixes: 13576/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_GDV_fuzzer-5681024577568768 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Reviewed-by: Paul B Mahol Signed-off-by: Michael Niedermayer --- libavcodec/gdv.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/libavcodec/gdv.c b/libavcodec/gdv.c index 183286b55f..9cf30c09e4 100644 --- a/libavcodec/gdv.c +++ b/libavcodec/gdv.c @@ -475,6 +475,8 @@ static int gdv_decode_frame(AVCodecContext *avctx, void *data, if (pal && pal_size == AVPALETTE_SIZE) memcpy(gdv->pal, pal, AVPALETTE_SIZE); + if (compression < 2 && bytestream2_get_bytes_left(gb) < 256*3) + return AVERROR_INVALIDDATA; rescale(gdv, gdv->frame, avctx->width, avctx->height, !!(flags & 0x10), !!(flags & 0x20)); @@ -482,8 +484,6 @@ static int gdv_decode_frame(AVCodecContext *avctx, void *data, case 1: memset(gdv->frame + PREAMBLE_SIZE, 0, gdv->frame_size - PREAMBLE_SIZE); case 0: - if (bytestream2_get_bytes_left(gb) < 256*3) - return AVERROR_INVALIDDATA; for (i = 0; i < 256; i++) { unsigned r = bytestream2_get_byte(gb); unsigned g = bytestream2_get_byte(gb);