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

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>
This commit is contained in:
Paul Moore 2019-12-23 16:38:36 -05:00
parent 030b995ad9
commit 15b590a81f
1 changed files with 6 additions and 0 deletions
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6
security/selinux/ss/services.c
View File

@ -1286,6 +1286,12 @@ int security_sidtab_hash_stats(struct selinux_state *state, char *page)
{ {
int rc; int rc;
if (!state->initialized) {
pr_err("SELinux: %s: called before initial load_policy\n",
__func__);
return -EINVAL;
}
read_lock(&state->ss->policy_rwlock); read_lock(&state->ss->policy_rwlock);
rc = sidtab_hash_stats(state->ss->sidtab, page); rc = sidtab_hash_stats(state->ss->sidtab, page);
read_unlock(&state->ss->policy_rwlock); read_unlock(&state->ss->policy_rwlock);