[bug report] apparmor: add support for mapping secids and using secctxes

[dan.carpenter@oracle.com (Dan Carpenter)]

Hello John Johansen,

The patch c092921219d2: "apparmor: add support for mapping secids and
using secctxes" from Jul 31, 2017, leads to the following static
checker warning:

	security/apparmor/secid.c:162 apparmor_secid_to_secctx()
	warn: unsigned '*seclen' is never less than zero.

security/apparmor/secid.c
   141  int apparmor_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
   142  {
   143          /* TODO: cache secctx and ref count so we don't have to recreate */
   144          struct aa_label *label = aa_secid_to_label(secid);
   145  
   146          AA_BUG(!secdata);
   147          AA_BUG(!seclen);
   148  
   149          if (!label)
   150                  return -EINVAL;
   151  
   152          if (secdata)
   153                  *seclen = aa_label_asxprint(secdata, root_ns, label,
                                  ^^^^^^^^^^^^^^^^^
This can return -ENOMEM on error.

   154                                              FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
   155                                              FLAG_HIDDEN_UNCONFINED |
   156                                              FLAG_ABS_ROOT, GFP_ATOMIC);
   157          else
   158                  *seclen = aa_label_snxprint(NULL, 0, root_ns, label,
   159                                              FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
   160                                              FLAG_HIDDEN_UNCONFINED |
   161                                              FLAG_ABS_ROOT);
   162          if (*seclen < 0)
                    ^^^^^^^^^^^
It's strange that this warning is only showing up now...

   163                  return -ENOMEM;
   164  
   165          return 0;
   166  }

regards,
dan carpenter
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