6.6-stable review patch. If anyone has any objections, please let me know.
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From: Christian Göttsche cgzones@googlemail.com
commit 37801a36b4d68892ce807264f784d818f8d0d39b upstream.
In case kern_mount() fails and returns an error pointer return in the error branch instead of continuing and dereferencing the error pointer.
While on it drop the never read static variable selinuxfs_mount.
Cc: stable@vger.kernel.org Fixes: 0619f0f5e36f ("selinux: wrap selinuxfs state") Signed-off-by: Christian Göttsche cgzones@googlemail.com Signed-off-by: Paul Moore paul@paul-moore.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- security/selinux/selinuxfs.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-)
--- a/security/selinux/selinuxfs.c +++ b/security/selinux/selinuxfs.c @@ -2135,7 +2135,6 @@ static struct file_system_type sel_fs_ty .kill_sb = sel_kill_sb, };
-static struct vfsmount *selinuxfs_mount __ro_after_init; struct path selinux_null __ro_after_init;
static int __init init_sel_fs(void) @@ -2157,18 +2156,21 @@ static int __init init_sel_fs(void) return err; }
- selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type); - if (IS_ERR(selinuxfs_mount)) { + selinux_null.mnt = kern_mount(&sel_fs_type); + if (IS_ERR(selinux_null.mnt)) { pr_err("selinuxfs: could not mount!\n"); - err = PTR_ERR(selinuxfs_mount); - selinuxfs_mount = NULL; + err = PTR_ERR(selinux_null.mnt); + selinux_null.mnt = NULL; + return err; } + selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root, &null_name); if (IS_ERR(selinux_null.dentry)) { pr_err("selinuxfs: could not lookup null!\n"); err = PTR_ERR(selinux_null.dentry); selinux_null.dentry = NULL; + return err; }
return err;