Commit adcd459f authored by Andrea Righi's avatar Andrea Righi Committed by Amir Goldstein
Browse files

ovl: validate superblock in OVL_FS() 



When CONFIG_OVERLAY_FS_DEBUG is enabled add an explicit check to make
sure that OVL_FS() is always used with a valid overlayfs superblock.
Otherwise trigger a WARN_ON_ONCE().

Reviewed-by: default avatarAmir Goldstein <amir73il@gmail.com>
Signed-off-by: default avatarAndrea Righi <andrea.righi@canonical.com>
Signed-off-by: default avatarAmir Goldstein <amir73il@gmail.com>
parent f01d0889

fs/overlayfs/ovl_entry.h

+3 −0
Original line number Diff line number Diff line
@@ -121,6 +121,9 @@ extern struct file_system_type ovl_fs_type; 


static inline struct ovl_fs *OVL_FS(struct super_block *sb)

{

	if (IS_ENABLED(CONFIG_OVERLAY_FS_DEBUG))

		WARN_ON_ONCE(sb->s_type != &ovl_fs_type);



	return (struct ovl_fs *)sb->s_fs_info;

}