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f2fs: fix wrong pointer access during try_to_free_nids 

If we release the lock in list_for_each_entry_safe, we can lose the tmp
pointer by alloc_nid.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2015-08-21 23:37:18 -07:00
parent 80c545055d
commit f7409d0fae
1 changed files with 1 additions and 3 deletions
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4
fs/f2fs/node.c
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@ -1664,11 +1664,9 @@ int try_to_free_nids(struct f2fs_sb_info *sbi, int nr_shrink)
if (i->state == NID_ALLOC)
continue;
__del_from_free_nid_list(nm_i, i);
nm_i->fcnt--;
spin_unlock(&nm_i->free_nid_list_lock);
kmem_cache_free(free_nid_slab, i);
nm_i->fcnt--;
nr_shrink--;
spin_lock(&nm_i->free_nid_list_lock);
}
spin_unlock(&nm_i->free_nid_list_lock);
mutex_unlock(&nm_i->build_lock);