Commits on Jul 9, 2021

1. common/buffer: fix SIGABRT in rebuild_aligned_size_and_memory …

   There is such a bl, which needs to satisfy two conditions:
   1)all ptrs' length sum except last ptr is aligned with 4K;
   2)the length of last ptr is 0.
   This bl will cause stack corruption when calling
   bufferlist::rebuild_aligned_size_and_memory().
   
   Deal with this special scenario in rebuild_aligned_size_and_memory() to
   solve the bug. And added a specialtest-case to reproduce this scenario.
   
   Fixes: https://tracker.ceph.com/issues/51419
   
   Signed-off-by: Yin Congmin <congmin.yin@intel.com>

   

   CongMinYin committed Jul 9, 2021
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