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ovl: validate superblock in OVL_FS()

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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: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
This commit is contained in:
Andrea Righi 2023-05-21 10:28:13 +02:00 committed by Amir Goldstein
parent f01d08899f
commit adcd459ff8
1 changed files with 3 additions and 0 deletions
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3
fs/overlayfs/ovl_entry.h
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@ -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;
}