5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Vasiliy Kovalev <kovalev@xxxxxxxxxxxx> commit c8b359dddb418c60df1a69beea01d1b3322bfe83 upstream. 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> Link: https://lore.kernel.org/linux-unionfs/CAJfpegvx-oS9XGuwpJx=Xe28_jzWx5eRo1y900_ZzWY+=gGzUg@xxxxxxxxxxxxxx/ Signed-off-by: Vasiliy Kovalev <kovalev@xxxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/overlayfs/util.c | 3 +++ 1 file changed, 3 insertions(+) --- a/fs/overlayfs/util.c +++ b/fs/overlayfs/util.c @@ -135,6 +135,9 @@ void ovl_dentry_init_flags(struct dentry 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 |
