xfs_buf_rele(): xfs: fix use-after-free race in xfs_buf_rele

["Alex Lyakas" <alex@xxxxxxxxxx>]

Hi Dave,

This commit
[37fd1678245f7a5898c1b05128bc481fb403c290 xfs: fix use-after-free race in 
xfs_buf_rele]
fixes a use-after-free issue.

We are looking at XFS buffer cache + LRU code in kernel 4.14, while the 
above fix arrived in kernel 4.19. Do you think this fix should be backported 
to stable kernels?

Thanks,
Alex.