ext4: fix potential race between online resizing and write operations

During an online resize an array of pointers to buffer heads gets
replaced so it can get enlarged.  If there is a racing block
allocation or deallocation which uses the old array, and the old array
has gotten reused this can lead to a GPF or some other random kernel
memory getting modified.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=206443
Link: https://lore.kernel.org/r/[email protected]
Reported-by: Suraj Jitindar Singh <[email protected]>
Signed-off-by: Theodore Ts'o <[email protected]>
Cc: [email protected]

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