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selinux: avoid dereference of garbage after mount failure

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commit 37801a36b4 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: 0619f0f5e3 ("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>
This commit is contained in:
Christian Göttsche 2024-03-28 20:16:58 +01:00 committed by Greg Kroah-Hartman
parent 9e2af26c29
commit 477ed6789e
1 changed files with 7 additions and 5 deletions
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12
security/selinux/selinuxfs.c
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@ -2135,7 +2135,6 @@ static struct file_system_type sel_fs_type = {
.kill_sb = sel_kill_sb, .kill_sb = sel_kill_sb,
}; };
static struct vfsmount *selinuxfs_mount __ro_after_init;
struct path selinux_null __ro_after_init; struct path selinux_null __ro_after_init;
static int __init init_sel_fs(void) static int __init init_sel_fs(void)
@ -2157,18 +2156,21 @@ static int __init init_sel_fs(void)
return err; return err;
} }
selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type); selinux_null.mnt = kern_mount(&sel_fs_type);
if (IS_ERR(selinuxfs_mount)) { if (IS_ERR(selinux_null.mnt)) {
pr_err("selinuxfs: could not mount!\n"); pr_err("selinuxfs: could not mount!\n");
err = PTR_ERR(selinuxfs_mount); err = PTR_ERR(selinux_null.mnt);
selinuxfs_mount = NULL; selinux_null.mnt = NULL;
return err;
} }
selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root, selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
&null_name); &null_name);
if (IS_ERR(selinux_null.dentry)) { if (IS_ERR(selinux_null.dentry)) {
pr_err("selinuxfs: could not lookup null!\n"); pr_err("selinuxfs: could not lookup null!\n");
err = PTR_ERR(selinux_null.dentry); err = PTR_ERR(selinux_null.dentry);
selinux_null.dentry = NULL; selinux_null.dentry = NULL;
return err;
} }
return err; return err;