ovl: fix oops in ovl_indexdir_cleanup() with nfs_export=on

Mounting with nfs_export=on, xfstests overlay/031 triggers a kernel panic
since v5.8-rc1 overlayfs updates.

 overlayfs: orphan index entry (index/00fb1..., ftype=4000, nlink=2)
 BUG: kernel NULL pointer dereference, address: 0000000000000030
 RIP: 0010:ovl_cleanup_and_whiteout+0x28/0x220 [overlay]

Bisect point at commit c21c839b8448 ("ovl: whiteout inode sharing")

Minimal reproducer:
--------------------------------------------------
rm -rf l u w m
mkdir -p l u w m
mkdir -p l/testdir
touch l/testdir/testfile
mount -t overlay -o lowerdir=l,upperdir=u,workdir=w,nfs_export=on overlay m
echo 1 > m/testdir/testfile
umount m
rm -rf u/testdir
mount -t overlay -o lowerdir=l,upperdir=u,workdir=w,nfs_export=on overlay m
umount m
--------------------------------------------------

When mount with nfs_export=on, and fail to verify an orphan index, we're
cleaning this index from indexdir by calling ovl_cleanup_and_whiteout().
This dereferences ofs->workdir, that was earlier set to NULL.

The design was that ovl->workdir will point at ovl->indexdir, but we are
assigning ofs->indexdir to ofs->workdir only after ovl_indexdir_cleanup().
There is no reason not to do it sooner, because once we get success from
ofs->indexdir = ovl_workdir_create(... there is no turning back.

Reported-and-tested-by: Murphy Zhou <jencce.kernel@gmail.com>
Fixes: c21c839b8448 ("ovl: whiteout inode sharing")
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 498d49d..31ef24d 100644 (file)
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -1354,6 +1354,12 @@ static int ovl_get_indexdir(struct super_block *sb, struct ovl_fs *ofs,
 
        ofs->indexdir = ovl_workdir_create(ofs, OVL_INDEXDIR_NAME, true);
        if (ofs->indexdir) {
+               /* index dir will act also as workdir */
+               iput(ofs->workdir_trap);
+               ofs->workdir_trap = NULL;
+               dput(ofs->workdir);
+               ofs->workdir = dget(ofs->indexdir);
+
                err = ovl_setup_trap(sb, ofs->indexdir, &ofs->indexdir_trap,
                                     "indexdir");
                if (err)
@@ -1852,20 +1858,12 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
                sb->s_flags |= SB_RDONLY;
 
        if (!(ovl_force_readonly(ofs)) && ofs->config.index) {
-               /* index dir will act also as workdir */
-               dput(ofs->workdir);
-               ofs->workdir = NULL;
-               iput(ofs->workdir_trap);
-               ofs->workdir_trap = NULL;
-
                err = ovl_get_indexdir(sb, ofs, oe, &upperpath);
                if (err)
                        goto out_free_oe;
 
                /* Force r/o mount with no index dir */
-               if (ofs->indexdir)
-                       ofs->workdir = dget(ofs->indexdir);
-               else
+               if (!ofs->indexdir)
                        sb->s_flags |= SB_RDONLY;
        }