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-rw-r--r--security/selinux/hooks.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 10350534de6d..2aa0e219d721 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2775,14 +2775,20 @@ static int selinux_umount(struct vfsmount *mnt, int flags)
static int selinux_fs_context_submount(struct fs_context *fc,
struct super_block *reference)
{
- const struct superblock_security_struct *sbsec;
+ const struct superblock_security_struct *sbsec = selinux_superblock(reference);
struct selinux_mnt_opts *opts;
+ /*
+ * Ensure that fc->security remains NULL when no options are set
+ * as expected by selinux_set_mnt_opts().
+ */
+ if (!(sbsec->flags & (FSCONTEXT_MNT|CONTEXT_MNT|DEFCONTEXT_MNT)))
+ return 0;
+
opts = kzalloc(sizeof(*opts), GFP_KERNEL);
if (!opts)
return -ENOMEM;
- sbsec = selinux_superblock(reference);
if (sbsec->flags & FSCONTEXT_MNT)
opts->fscontext_sid = sbsec->sid;
if (sbsec->flags & CONTEXT_MNT)