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hfsplus: fix BUG on bnode parent update

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Creating, renaming or deleting a file may hit BUG_ON() if the first
record of both a leaf node and its parent are changed, and if this
forces the parent to be split.  This bug is triggered by xfstests
generic/027, somewhat rarely; here is a more reliable reproducer:

  truncate -s 50M fs.iso
  mkfs.hfsplus fs.iso
  mount fs.iso /mnt
  i=1000
  while [ $i -le 2400 ]; do
    touch /mnt/$i &>/dev/null
    ((++i))
  done
  i=2400
  while [ $i -ge 1000 ]; do
    mv /mnt/$i /mnt/$(perl -e "print $i x61") &>/dev/null
    ((--i))
  done

The issue is that a newly created bnode is being put twice.  Reset
new_node to NULL in hfs_brec_update_parent() before reaching goto again.

Link: http://lkml.kernel.org/r/5ee1db09b60373a15890f6a7c835d00e76bf601d.1535682461.git.ernesto.mnd.fernandez@gmail.com
Signed-off-by: Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ernesto A. Fernández 2018-10-30 15:06:04 -07:00 committed by Linus Torvalds
parent 0a3021d4f5
commit 19a9d0f1ac
1 changed files with 1 additions and 0 deletions
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1
fs/hfsplus/brec.c
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@ -449,6 +449,7 @@ skip:
/* restore search_key */ /* restore search_key */
hfs_bnode_read_key(node, fd->search_key, 14); hfs_bnode_read_key(node, fd->search_key, 14);
} }
new_node = NULL;
} }
if (!rec && node->parent) if (!rec && node->parent)