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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 <h.leppkes@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-07-04 22:33:52 +02:00
parent 24bb7db403
commit c8cfbc6629
1 changed files with 4 additions and 4 deletions
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8
libavcodec/hevcdec.c
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@ -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;