btrfs: clear DEAD_RELOC_TREE before dropping the reloc root

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The DEAD_RELOC_TREE flag is in place in order to avoid a use after free
in init_reloc_root, tracking the presence of reloc_root.  However adding
the explicit tree references in previous patches makes the use after
free impossible because at this point we no longer have a reloc_control
set on the fs_info and thus cannot enter the function.

So move this to be coupled with clearing the root->reloc_root so we're
consistent with all other operations of the reloc root.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ update changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>

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Josef Bacik 2020-03-13 11:44:46 -04:00 • committed by David Sterba

parent 1a0afa0ecf

commit f28de8d8fd

1 changed files with 6 additions and 6 deletions

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fs/btrfs/relocation.c

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