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UPSTREAM: selinux: ensure the policy has been loaded before reading the sidtab stats

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Check to make sure we have loaded a policy before we query the
sidtab's hash stats.  Failure to do so could result in a kernel
panic/oops due to a dereferenced NULL pointer.

Fixes: 66f8e2f03c ("selinux: sidtab reverse lookup hash table")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
(cherry picked from commit 15b590a81f)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I7e18ac17ee6c89d2a63caf02efcfb597f21f2c54
This commit is contained in:
Paul Moore 2019-12-23 16:38:36 -05:00 committed by Greg Kroah-Hartman
parent a3d2e129b7
commit cf84a06a47
1 changed files with 6 additions and 0 deletions
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6
security/selinux/ss/services.c
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@ -1276,6 +1276,12 @@ int security_sidtab_hash_stats(struct selinux_state *state, char *page)
{
int rc;
if (!state->initialized) {
pr_err("SELinux: %s: called before initial load_policy\n",
__func__);
return -EINVAL;
}
read_lock(&state->ss->policy_rwlock);
rc = sidtab_hash_stats(state->ss->sidtab, page);
read_unlock(&state->ss->policy_rwlock);