From c8cfbc6629c1fe5755b59a3bcfd95ad08b843a07 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Tue, 4 Jul 2017 22:33:52 +0200 Subject: [PATCH] avcodec/hevcdec: do not let updated extradata corrupt state Fixes: out of array access Fixes: 2451/clusterfuzz-testcase-minimized-4781613957251072 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Reviewed-by: Hendrik Leppkes Signed-off-by: Michael Niedermayer --- libavcodec/hevcdec.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/libavcodec/hevcdec.c b/libavcodec/hevcdec.c index cc8ac82164..55f51211c3 100644 --- a/libavcodec/hevcdec.c +++ b/libavcodec/hevcdec.c @@ -3057,7 +3057,7 @@ static int verify_md5(HEVCContext *s, AVFrame *frame) return 0; } -static int hevc_decode_extradata(HEVCContext *s, uint8_t *buf, int length) +static int hevc_decode_extradata(HEVCContext *s, uint8_t *buf, int length, int first) { int ret, i; @@ -3069,7 +3069,7 @@ static int hevc_decode_extradata(HEVCContext *s, uint8_t *buf, int length) /* export stream parameters from the first SPS */ for (i = 0; i < FF_ARRAY_ELEMS(s->ps.sps_list); i++) { - if (s->ps.sps_list[i]) { + if (first && s->ps.sps_list[i]) { const HEVCSPS *sps = (const HEVCSPS*)s->ps.sps_list[i]->data; export_stream_params(s->avctx, &s->ps, sps); break; @@ -3099,7 +3099,7 @@ static int hevc_decode_frame(AVCodecContext *avctx, void *data, int *got_output, new_extradata = av_packet_get_side_data(avpkt, AV_PKT_DATA_NEW_EXTRADATA, &new_extradata_size); if (new_extradata && new_extradata_size > 0) { - ret = hevc_decode_extradata(s, new_extradata, new_extradata_size); + ret = hevc_decode_extradata(s, new_extradata, new_extradata_size, 0); if (ret < 0) return ret; } @@ -3387,7 +3387,7 @@ static av_cold int hevc_decode_init(AVCodecContext *avctx) s->threads_number = 1; if (avctx->extradata_size > 0 && avctx->extradata) { - ret = hevc_decode_extradata(s, avctx->extradata, avctx->extradata_size); + ret = hevc_decode_extradata(s, avctx->extradata, avctx->extradata_size, 1); if (ret < 0) { hevc_decode_free(avctx); return ret;