netdev - inconsistent null checking in ipx

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20120514205618.GB20836@elgon.mountain>
Date:	Mon, 14 May 2012 23:56:18 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	netdev@...r.kernel.org
Subject: inconsistent null checking in ipx_ioctl()

Hi, I'm working on some new Smatch stuff and going through some warnings
in old code.

----
This is a semi-automatic email about new static checker warnings.

The patch b0d0d915d1d1: "ipx: remove the BKL" from Jan 25, 2011, 
leads to the following Smatch complaint:

net/ipx/af_ipx.c:1928 ipx_ioctl()
	 error: we previously assumed 'sk' could be null (see line 1913)

net/ipx/af_ipx.c
  1912			rc = -EINVAL;
  1913			if (sk)
                           ^^^^
Check.

  1914				rc = sock_get_timestamp(sk, argp);
  1915			break;
  1916		case SIOCGIFDSTADDR:
  1917		case SIOCSIFDSTADDR:
  1918		case SIOCGIFBRDADDR:
  1919		case SIOCSIFBRDADDR:
  1920		case SIOCGIFNETMASK:
  1921		case SIOCSIFNETMASK:
  1922			rc = -EINVAL;
  1923			break;
  1924		default:
  1925			rc = -ENOIOCTLCMD;
  1926			break;
  1927		}
  1928		release_sock(sk);
                ^^^^^^^^^^^^^^^^^
The lock and release functions dereference "sk".  Probably the check
can be removed.  The rest of the function dereferences "sk" without
checking.  A lot of this code goes back to 2.6.12.

  1929	
  1930		return rc;

regards,
dan carpenter

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html