From d702769213487923c0fb0abe4b61f4d9ebddb88b Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Tue, 25 Sep 2018 02:36:35 +0200 Subject: [PATCH] avcodec/scpr: Skip frames which change nothing Fixes: Timeout Fixes: 10292/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SCPR_fuzzer-5687943864254464 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavcodec/scpr.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/libavcodec/scpr.c b/libavcodec/scpr.c index 81597aa4dc..e41fbbec13 100644 --- a/libavcodec/scpr.c +++ b/libavcodec/scpr.c @@ -516,7 +516,7 @@ static int decompress_p(AVCodecContext *avctx, int backstep = linesize - avctx->width; if (bytestream2_get_byte(gb) == 0) - return 0; + return 1; bytestream2_skip(gb, 1); init_rangecoder(&s->rc, gb); @@ -813,6 +813,8 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, s->current_frame->linesize[0] / 4, (uint32_t *)s->last_frame->data[0], s->last_frame->linesize[0] / 4); + if (ret == 1) + return avpkt->size; } else { return AVERROR_PATCHWELCOME; }