shithub: libvpx

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webm_read_frame: avoid NULL dereference

block may be NULL with block_entry_eos or from return of GetBlock()

Change-Id: Ia0dd3ffa46305ee70efcdc55c05c2ad24efc993b

--- a/webmdec.cc

+++ b/webmdec.cc

@@ -165,10 +165,11 @@

     }

     if (get_new_block) {

       block = block_entry->GetBlock();

+      if (block == NULL) return -1;

       webm_ctx->block_frame_index = 0;

     }

-  } while (block->GetTrackNumber() != webm_ctx->video_track_index ||

-           block_entry_eos);

+  } while (block_entry_eos ||

+           block->GetTrackNumber() != webm_ctx->video_track_index);

   webm_ctx->cluster = cluster;

   webm_ctx->block_entry = block_entry;