This fixes race conditions that ultimately lead to memory corruption.
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avctx->time_base);
}
+int ff_thread_can_start_frame(AVCodecContext *avctx);
+
#endif /* AVCODEC_INTERNAL_H */
assert(s->last_picture_ptr == NULL || s->out_format != FMT_H264 ||
s->codec_id == CODEC_ID_SVQ3);
+ if (!ff_thread_can_start_frame(avctx)) {
+ av_log(avctx, AV_LOG_ERROR, "Attempt to start a frame outside SETUP state\n");
+ return -1;
+ }
+
/* mark & release old frames */
if (s->out_format != FMT_H264 || s->codec_id == CODEC_ID_SVQ3) {
if (s->pict_type != AV_PICTURE_TYPE_B && s->last_picture_ptr &&
return p->progress[i];
}
+int ff_thread_can_start_frame(AVCodecContext *avctx)
+{
+ PerThreadContext *p = avctx->thread_opaque;
+ if ((avctx->active_thread_type&FF_THREAD_FRAME) && p->state != STATE_SETTING_UP &&
+ (avctx->codec->update_thread_context || (!avctx->thread_safe_callbacks &&
+ avctx->get_buffer != avcodec_default_get_buffer))) {
+ return 0;
+ }
+ return 1;
+}
+
int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f)
{
PerThreadContext *p = avctx->thread_opaque;
{
}
+int ff_thread_can_start_frame(AVCodecContext *avctx)
+{
+ return 1;
+}
+
#endif
enum AVMediaType avcodec_get_type(enum CodecID codec_id)