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| author | Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com> | 2018-10-30 23:06:00 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-10-31 16:54:13 +0100 |
| commit | 0a3021d4f5295aa073c7bf5c5e4de60a2e292578 (patch) | |
| tree | 1ebc07aaea1a9ddab9837c240a41119d67531344 /fs/hfsplus | |
| parent | init/do_mounts.c: add root=PARTLABEL=<name> support (diff) | |
| download | linux-0a3021d4f5295aa073c7bf5c5e4de60a2e292578.tar.xz linux-0a3021d4f5295aa073c7bf5c5e4de60a2e292578.zip | |
hfsplus: prevent btree data loss on root split
Creating, renaming or deleting a file may cause catalog corruption and
data loss. This bug is randomly triggered by xfstests generic/027, but
here is a faster reproducer:
truncate -s 50M fs.iso
mkfs.hfsplus fs.iso
mount fs.iso /mnt
i=100
while [ $i -le 150 ]; do
touch /mnt/$i &>/dev/null
((++i))
done
i=100
while [ $i -le 150 ]; do
mv /mnt/$i /mnt/$(perl -e "print $i x82") &>/dev/null
((++i))
done
umount /mnt
fsck.hfsplus -n fs.iso
The bug is triggered whenever hfs_brec_update_parent() needs to split the
root node. The height of the btree is not increased, which leaves the new
node orphaned and its records lost.
Link: http://lkml.kernel.org/r/26d882184fc43043a810114258f45277752186c7.1535682461.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>
Diffstat (limited to 'fs/hfsplus')
| -rw-r--r-- | fs/hfsplus/brec.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/hfsplus/brec.c b/fs/hfsplus/brec.c index ed8eacb34452..aa17a392b414 100644 --- a/fs/hfsplus/brec.c +++ b/fs/hfsplus/brec.c @@ -429,6 +429,10 @@ skip: if (new_node) { __be32 cnid; + if (!new_node->parent) { + hfs_btree_inc_height(tree); + new_node->parent = tree->root; + } fd->bnode = hfs_bnode_find(tree, new_node->parent); /* create index key and entry */ hfs_bnode_read_key(new_node, fd->search_key, 14); |