libavcodec/h264.c:7644: error: Buffer Overrun L3
  Offset: [-1, +oo] Size: 8 by call to `execute_decode_slices`.

libavcodec/h264.c:7463:5: Assignment
7461.     int buf_index=0;
7462.     H264Context *hx; ///< thread context
7463.     int context_count = 0;
          ^
7464.     int next_avc= h->is_avc ? 0 : buf_size;
7465. 

libavcodec/h264.c:7644:13: Call
7642. 
7643.         if(context_count == h->max_contexts) {
7644.             execute_decode_slices(h, context_count);
                  ^
7645.             context_count = 0;
7646.         }

libavcodec/h264.c:7424:1: <Offset trace>
7422.  * @param context_count number of contexts to execute
7423.  */
7424. static void execute_decode_slices(H264Context *h, int context_count){
      ^
7425.     MpegEncContext * const s = &h->s;
7426.     AVCodecContext * const avctx= s->avctx;

libavcodec/h264.c:7424:1: Parameter `context_count`
  7422.  * @param context_count number of contexts to execute
  7423.  */
  7424. static void execute_decode_slices(H264Context *h, int context_count){
        ^
  7425.     MpegEncContext * const s = &h->s;
  7426.     AVCodecContext * const avctx= s->avctx;

libavcodec/h264.c:7424:1: <Length trace>
7422.  * @param context_count number of contexts to execute
7423.  */
7424. static void execute_decode_slices(H264Context *h, int context_count){
      ^
7425.     MpegEncContext * const s = &h->s;
7426.     AVCodecContext * const avctx= s->avctx;

libavcodec/h264.c:7424:1: Parameter `h->thread_context[*]`
  7422.  * @param context_count number of contexts to execute
  7423.  */
  7424. static void execute_decode_slices(H264Context *h, int context_count){
        ^
  7425.     MpegEncContext * const s = &h->s;
  7426.     AVCodecContext * const avctx= s->avctx;

libavcodec/h264.c:7447:14: Array access: Offset: [-1, +oo] Size: 8 by call to `execute_decode_slices` 
  7445. 
  7446.         /* pull back stuff from slices to master context */
  7447.         hx = h->thread_context[context_count - 1];
                     ^
  7448.         s->mb_x = hx->s.mb_x;
  7449.         s->mb_y = hx->s.mb_y;
