selinux: avoid dereference of garbage after mount failure
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>
This commit is contained in:
parent
4cece76496
commit
37801a36b4
@ -2123,7 +2123,6 @@ static struct file_system_type sel_fs_type = {
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.kill_sb = sel_kill_sb,
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.kill_sb = sel_kill_sb,
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};
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};
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static struct vfsmount *selinuxfs_mount __ro_after_init;
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struct path selinux_null __ro_after_init;
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struct path selinux_null __ro_after_init;
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static int __init init_sel_fs(void)
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static int __init init_sel_fs(void)
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@ -2145,18 +2144,21 @@ static int __init init_sel_fs(void)
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return err;
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return err;
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}
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}
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selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
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selinux_null.mnt = kern_mount(&sel_fs_type);
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if (IS_ERR(selinuxfs_mount)) {
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if (IS_ERR(selinux_null.mnt)) {
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pr_err("selinuxfs: could not mount!\n");
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pr_err("selinuxfs: could not mount!\n");
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err = PTR_ERR(selinuxfs_mount);
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err = PTR_ERR(selinux_null.mnt);
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selinuxfs_mount = NULL;
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selinux_null.mnt = NULL;
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return err;
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}
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}
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selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
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selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
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&null_name);
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&null_name);
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if (IS_ERR(selinux_null.dentry)) {
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if (IS_ERR(selinux_null.dentry)) {
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pr_err("selinuxfs: could not lookup null!\n");
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pr_err("selinuxfs: could not lookup null!\n");
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err = PTR_ERR(selinux_null.dentry);
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err = PTR_ERR(selinux_null.dentry);
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selinux_null.dentry = NULL;
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selinux_null.dentry = NULL;
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return err;
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}
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}
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return err;
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return err;
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