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[87.10.127.160]) by smtp.gmail.com with ESMTPSA id z17-20020aa7cf91000000b004c2158e87e6sm1656646edx.97.2023.05.21.01.28.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 21 May 2023 01:28:17 -0700 (PDT) From: Andrea Righi To: Miklos Szeredi Cc: Amir Goldstein , linux-unionfs@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 3/3] ovl: validate superblock in OVL_FS() Date: Sun, 21 May 2023 10:28:13 +0200 Message-Id: <20230521082813.17025-4-andrea.righi@canonical.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230521082813.17025-1-andrea.righi@canonical.com> References: <20230521082813.17025-1-andrea.righi@canonical.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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 Signed-off-by: Andrea Righi --- fs/overlayfs/ovl_entry.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/fs/overlayfs/ovl_entry.h b/fs/overlayfs/ovl_entry.h index b32c38fdf3c7..e156649d9c71 100644 --- a/fs/overlayfs/ovl_entry.h +++ b/fs/overlayfs/ovl_entry.h @@ -97,8 +97,20 @@ static inline struct mnt_idmap *ovl_upper_mnt_idmap(stru= ct ovl_fs *ofs) =20 extern struct file_system_type ovl_fs_type; =20 +static inline bool is_ovl_fs_sb(struct super_block *sb) +{ + return sb->s_type =3D=3D &ovl_fs_type; +} + +#ifdef CONFIG_OVERLAY_FS_DEBUG +#define OVL_VALIDATE_SB(__sb) WARN_ON_ONCE(!is_ovl_fs_sb(__sb)) +#else +#define OVL_VALIDATE_SB(__sb) +#endif + static inline struct ovl_fs *OVL_FS(struct super_block *sb) { + OVL_VALIDATE_SB(sb); return (struct ovl_fs *)sb->s_fs_info; } =20 --=20 2.39.2