libavcodec/dvbsubdec.c:1309: error: Null Dereference
  pointer `sub->rects` last assigned on line 1277 could be null and is dereferenced at line 1309, column 16.

libavcodec/dvbsubdec.c:1263:1: start of procedure dvbsub_display_end_segment()
1261. }
1262. 
1263. static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
      ^
1264.                                       int buf_size, AVSubtitle *sub)
1265. {

libavcodec/dvbsubdec.c:1266:5: 
1264.                                       int buf_size, AVSubtitle *sub)
1265. {
1266.     DVBSubContext *ctx = avctx->priv_data;
          ^
1267.     DVBSubDisplayDefinition *display_def = ctx->display_definition;
1268. 

libavcodec/dvbsubdec.c:1267:5: 
1265. {
1266.     DVBSubContext *ctx = avctx->priv_data;
1267.     DVBSubDisplayDefinition *display_def = ctx->display_definition;
          ^
1268. 
1269.     DVBSubRegion *region;

libavcodec/dvbsubdec.c:1275:5: 
1273.     uint32_t *clut_table;
1274.     int i;
1275.     int offset_x=0, offset_y=0;
          ^
1276. 
1277.     sub->rects = NULL;

libavcodec/dvbsubdec.c:1277:5: 
1275.     int offset_x=0, offset_y=0;
1276. 
1277.     sub->rects = NULL;
          ^
1278.     sub->start_display_time = 0;
1279.     sub->end_display_time = ctx->time_out * 1000;

libavcodec/dvbsubdec.c:1278:5: 
1276. 
1277.     sub->rects = NULL;
1278.     sub->start_display_time = 0;
          ^
1279.     sub->end_display_time = ctx->time_out * 1000;
1280.     sub->format = 0;

libavcodec/dvbsubdec.c:1279:5: 
1277.     sub->rects = NULL;
1278.     sub->start_display_time = 0;
1279.     sub->end_display_time = ctx->time_out * 1000;
          ^
1280.     sub->format = 0;
1281. 

libavcodec/dvbsubdec.c:1280:5: 
1278.     sub->start_display_time = 0;
1279.     sub->end_display_time = ctx->time_out * 1000;
1280.     sub->format = 0;
          ^
1281. 
1282.     if (display_def) {

libavcodec/dvbsubdec.c:1282:9: Taking true branch
1280.     sub->format = 0;
1281. 
1282.     if (display_def) {
              ^
1283.         offset_x = display_def->x;
1284.         offset_y = display_def->y;

libavcodec/dvbsubdec.c:1283:9: 
1281. 
1282.     if (display_def) {
1283.         offset_x = display_def->x;
              ^
1284.         offset_y = display_def->y;
1285.     }

libavcodec/dvbsubdec.c:1284:9: 
1282.     if (display_def) {
1283.         offset_x = display_def->x;
1284.         offset_y = display_def->y;
              ^
1285.     }
1286. 

libavcodec/dvbsubdec.c:1287:5: 
1285.     }
1286. 
1287.     sub->num_rects = ctx->display_list_size;
          ^
1288. 
1289.     if (sub->num_rects > 0) {

libavcodec/dvbsubdec.c:1289:9: Taking false branch
1287.     sub->num_rects = ctx->display_list_size;
1288. 
1289.     if (sub->num_rects > 0) {
              ^
1290.         sub->rects = av_mallocz(sizeof(*sub->rects) * sub->num_rects);
1291.         if (!sub->rects)

libavcodec/dvbsubdec.c:1305:5: 
1303.     }
1304. 
1305.     i = 0;
          ^
1306. 
1307.     for (display = ctx->display_list; display; display = display->next) {

libavcodec/dvbsubdec.c:1307:10: 
1305.     i = 0;
1306. 
1307.     for (display = ctx->display_list; display; display = display->next) {
               ^
1308.         region = get_region(ctx, display->region_id);
1309.         rect = sub->rects[i];

libavcodec/dvbsubdec.c:1307:39: Loop condition is true. Entering loop body
1305.     i = 0;
1306. 
1307.     for (display = ctx->display_list; display; display = display->next) {
                                            ^
1308.         region = get_region(ctx, display->region_id);
1309.         rect = sub->rects[i];

libavcodec/dvbsubdec.c:1308:9: 
1306. 
1307.     for (display = ctx->display_list; display; display = display->next) {
1308.         region = get_region(ctx, display->region_id);
              ^
1309.         rect = sub->rects[i];
1310. 

libavcodec/dvbsubdec.c:148:1: start of procedure get_region()
  146. }
  147. 
  148. static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
       ^
  149. {
  150.     DVBSubRegion *ptr = ctx->region_list;

libavcodec/dvbsubdec.c:150:5: 
  148. static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
  149. {
  150.     DVBSubRegion *ptr = ctx->region_list;
           ^
  151. 
  152.     while (ptr && ptr->id != region_id) {

libavcodec/dvbsubdec.c:152:12: Loop condition is true. Entering loop body
  150.     DVBSubRegion *ptr = ctx->region_list;
  151. 
  152.     while (ptr && ptr->id != region_id) {
                  ^
  153.         ptr = ptr->next;
  154.     }

libavcodec/dvbsubdec.c:152:19: Loop condition is true. Entering loop body
  150.     DVBSubRegion *ptr = ctx->region_list;
  151. 
  152.     while (ptr && ptr->id != region_id) {
                         ^
  153.         ptr = ptr->next;
  154.     }

libavcodec/dvbsubdec.c:153:9: 
  151. 
  152.     while (ptr && ptr->id != region_id) {
  153.         ptr = ptr->next;
               ^
  154.     }
  155. 

libavcodec/dvbsubdec.c:152:12: Loop condition is true. Entering loop body
  150.     DVBSubRegion *ptr = ctx->region_list;
  151. 
  152.     while (ptr && ptr->id != region_id) {
                  ^
  153.         ptr = ptr->next;
  154.     }

libavcodec/dvbsubdec.c:152:19: Loop condition is true. Entering loop body
  150.     DVBSubRegion *ptr = ctx->region_list;
  151. 
  152.     while (ptr && ptr->id != region_id) {
                         ^
  153.         ptr = ptr->next;
  154.     }

libavcodec/dvbsubdec.c:153:9: 
  151. 
  152.     while (ptr && ptr->id != region_id) {
  153.         ptr = ptr->next;
               ^
  154.     }
  155. 

libavcodec/dvbsubdec.c:152:12: Loop condition is true. Entering loop body
  150.     DVBSubRegion *ptr = ctx->region_list;
  151. 
  152.     while (ptr && ptr->id != region_id) {
                  ^
  153.         ptr = ptr->next;
  154.     }

libavcodec/dvbsubdec.c:152:19: Loop condition is false. Leaving loop
  150.     DVBSubRegion *ptr = ctx->region_list;
  151. 
  152.     while (ptr && ptr->id != region_id) {
                         ^
  153.         ptr = ptr->next;
  154.     }

libavcodec/dvbsubdec.c:156:5: 
  154.     }
  155. 
  156.     return ptr;
           ^
  157. }
  158. 

libavcodec/dvbsubdec.c:157:1: return from a call to get_region
  155. 
  156.     return ptr;
  157. }
       ^
  158. 
  159. static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)

libavcodec/dvbsubdec.c:1309:9: 
1307.     for (display = ctx->display_list; display; display = display->next) {
1308.         region = get_region(ctx, display->region_id);
1309.         rect = sub->rects[i];
              ^
1310. 
1311.         if (!region)
