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Btrfs: just free dummy extent buffers 

If we fail during our sanity tests we could get NULL deref's because we unload
the module before the dummy extent buffers are free'd via RCU.  So check for
this case and just free the things directly.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
This commit is contained in:
Josef Bacik 2015-03-16 17:38:02 -04:00
parent ba11721355
commit bcb7e449ec
1 changed files with 6 additions and 0 deletions
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6
fs/btrfs/extent_io.c
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@ -4968,6 +4968,12 @@ static int release_extent_buffer(struct extent_buffer *eb)
/* Should be safe to release our pages at this point */
btrfs_release_extent_buffer_page(eb);
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
if (unlikely(test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags))) {
__free_extent_buffer(eb);
return 1;
}
#endif
call_rcu(&eb->rcu_head, btrfs_release_extent_buffer_rcu);
return 1;
}