Add a check to the ovl_dentry_weird() function to prevent the processing of directory inodes that lack the lookup function. This is important because such inodes can cause errors in overlayfs when passed to the lowerstack. Reported-by: syzbot+a8c9d476508bd14a90e5@xxxxxxxxxxxxxxxxxxxxxxxxx Link: https://syzkaller.appspot.com/bug?extid=a8c9d476508bd14a90e5 Suggested-by: Miklos Szeredi <miklos@xxxxxxxxxx> Signed-off-by: Vasiliy Kovalev <kovalev@xxxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> --- fs/overlayfs/util.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c index 3bb107471fb42..9aa7493b1e103 100644 --- a/fs/overlayfs/util.c +++ b/fs/overlayfs/util.c @@ -202,6 +202,9 @@ void ovl_dentry_init_flags(struct dentry *dentry, struct dentry *upperdentry, bool ovl_dentry_weird(struct dentry *dentry) { + if (!d_can_lookup(dentry) && !d_is_file(dentry) && !d_is_symlink(dentry)) + return true; + return dentry->d_flags & (DCACHE_NEED_AUTOMOUNT | DCACHE_MANAGE_TRANSIT | DCACHE_OP_HASH | -- 2.33.8
