From cf9481e289247fe9cf40f2e2481220d899132049 Mon Sep 17 00:00:00 2001 From: David Howells Date: Sun, 27 Jul 2008 21:31:07 +1000 Subject: SELinux: Fix a potentially uninitialised variable in SELinux hooks Fix a potentially uninitialised variable in SELinux hooks that's given a pointer to the network address by selinux_parse_skb() passing a pointer back through its argument list. By restructuring selinux_parse_skb(), the compiler can see that the error case need not set it as the caller will return immediately. Signed-off-by: David Howells Signed-off-by: James Morris --- security/selinux/hooks.c | 42 ++++++++++++++++++++++++------------------ 1 file changed, 24 insertions(+), 18 deletions(-) (limited to 'security') diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 0ffd8814af3e..3eae30609702 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -3539,38 +3539,44 @@ out: #endif /* IPV6 */ static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad, - char **addrp, int src, u8 *proto) + char **_addrp, int src, u8 *proto) { - int ret = 0; + char *addrp; + int ret; switch (ad->u.net.family) { case PF_INET: ret = selinux_parse_skb_ipv4(skb, ad, proto); - if (ret || !addrp) - break; - *addrp = (char *)(src ? &ad->u.net.v4info.saddr : - &ad->u.net.v4info.daddr); - break; + if (ret) + goto parse_error; + addrp = (char *)(src ? &ad->u.net.v4info.saddr : + &ad->u.net.v4info.daddr); + goto okay; #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) case PF_INET6: ret = selinux_parse_skb_ipv6(skb, ad, proto); - if (ret || !addrp) - break; - *addrp = (char *)(src ? &ad->u.net.v6info.saddr : - &ad->u.net.v6info.daddr); - break; + if (ret) + goto parse_error; + addrp = (char *)(src ? &ad->u.net.v6info.saddr : + &ad->u.net.v6info.daddr); + goto okay; #endif /* IPV6 */ default: - break; + addrp = NULL; + goto okay; } - if (unlikely(ret)) - printk(KERN_WARNING - "SELinux: failure in selinux_parse_skb()," - " unable to parse packet\n"); - +parse_error: + printk(KERN_WARNING + "SELinux: failure in selinux_parse_skb()," + " unable to parse packet\n"); return ret; + +okay: + if (_addrp) + *_addrp = addrp; + return 0; } /** -- cgit v1.2.3