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| author | David Sterba <dsterba@suse.com> | 2024-01-19 21:19:18 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-04-13 12:50:15 +0200 |
| commit | 8b11774810aadeda80d4eb54f648eaf88f369d22 (patch) | |
| tree | 779d7d2a2567df2b8cdea53ed1f92138249c559a /fs | |
| parent | bebd9e0ff90034875c5dfe4bd514fd7055fc7a89 (diff) | |
| download | linux-stable-8b11774810aadeda80d4eb54f648eaf88f369d22.tar.gz linux-stable-8b11774810aadeda80d4eb54f648eaf88f369d22.tar.bz2 linux-stable-8b11774810aadeda80d4eb54f648eaf88f369d22.zip | |
btrfs: export: handle invalid inode or root reference in btrfs_get_parent()
[ Upstream commit 26b66d1d366a375745755ca7365f67110bbf6bd5 ]
The get_parent handler looks up a parent of a given dentry, this can be
either a subvolume or a directory. The search is set up with offset -1
but it's never expected to find such item, as it would break allowed
range of inode number or a root id. This means it's a corruption (ext4
also returns this error code).
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/export.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/btrfs/export.c b/fs/btrfs/export.c index ecc33e3a3c06..01e9a5afc33b 100644 --- a/fs/btrfs/export.c +++ b/fs/btrfs/export.c @@ -182,8 +182,15 @@ struct dentry *btrfs_get_parent(struct dentry *child) ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); if (ret < 0) goto fail; + if (ret == 0) { + /* + * Key with offset of -1 found, there would have to exist an + * inode with such number or a root with such id. + */ + ret = -EUCLEAN; + goto fail; + } - BUG_ON(ret == 0); /* Key with offset of -1 found */ if (path->slots[0] == 0) { ret = -ENOENT; goto fail; |