diff options
| author | Ryusuke Konishi <konishi.ryusuke@gmail.com> | 2022-10-02 06:08:04 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-10-15 08:55:49 +0300 |
| commit | 3f840480e31495ce674db4a69912882b5ac083f2 (patch) | |
| tree | ff3aaf74826d97781cd448e3f8ba341b27d178aa /fs | |
| parent | 014862eecf03f58066a957027dde73cbecdf4395 (diff) | |
| download | linux-3f840480e31495ce674db4a69912882b5ac083f2.tar.xz | |
nilfs2: fix NULL pointer dereference at nilfs_bmap_lookup_at_level()
commit 21a87d88c2253350e115029f14fe2a10a7e6c856 upstream.
If the i_mode field in inode of metadata files is corrupted on disk, it
can cause the initialization of bmap structure, which should have been
called from nilfs_read_inode_common(), not to be called. This causes a
lockdep warning followed by a NULL pointer dereference at
nilfs_bmap_lookup_at_level().
This patch fixes these issues by adding a missing sanitiy check for the
i_mode field of metadata file's inode.
Link: https://lkml.kernel.org/r/20221002030804.29978-1-konishi.ryusuke@gmail.com
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Reported-by: syzbot+2b32eb36c1a825b7a74c@syzkaller.appspotmail.com
Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Tested-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nilfs2/inode.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c index 95684fa3c985..de7de1187db7 100644 --- a/fs/nilfs2/inode.c +++ b/fs/nilfs2/inode.c @@ -444,6 +444,8 @@ int nilfs_read_inode_common(struct inode *inode, inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec); inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); + if (nilfs_is_metadata_file_inode(inode) && !S_ISREG(inode->i_mode)) + return -EIO; /* this inode is for metadata and corrupted */ if (inode->i_nlink == 0) return -ESTALE; /* this inode is deleted */ |