From 380a3a0adfae7aa898d2ec8a5b0d5cd949a11111 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Thu, 3 Dec 2020 23:41:10 +0100 Subject: avcodec/rasc: Check frame before clearing Fixes: null pointer dereference Fixes: 27737/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RASC_fuzzer-5769028685266944 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavcodec/rasc.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'libavcodec/rasc.c') diff --git a/libavcodec/rasc.c b/libavcodec/rasc.c index cdf20a6db9..706940bf5f 100644 --- a/libavcodec/rasc.c +++ b/libavcodec/rasc.c @@ -70,6 +70,9 @@ static void clear_plane(AVCodecContext *avctx, AVFrame *frame) RASCContext *s = avctx->priv_data; uint8_t *dst = frame->data[0]; + if (!dst) + return; + for (int y = 0; y < avctx->height; y++) { memset(dst, 0, avctx->width * s->bpp); dst += frame->linesize[0]; -- cgit v1.2.3