[PATCH 4.14 056/146] f2fs: fix to do sanity check with cp_pack_start_sum

4.14-stable review patch. If anyone has any objections, please let me know. -- commit e494c2f995d6181d6e29c4927d68e0f295ecf75b upstream. After fuzzing, cp_pack_start_sum could be corrupted, so current log's summary info should be wrong due to loading incorrect summary block.

[PATCH 4.14 056/146] f2fs: fix to do sanity check with cp_pack_start_sum

4.14-stable review patch. If anyone has any objections, please let me know. -- commit e494c2f995d6181d6e29c4927d68e0f295ecf75b upstream. After fuzzing, cp_pack_start_sum could be corrupted, so current log's summary info should be wrong due to loading incorrect summary block.