From: Arnd Bergmann <arnd@arndb.de>
To: Paul Moore <paul@paul-moore.com>,
Stephen Smalley <sds@tycho.nsa.gov>,
Eric Paris <eparis@parisplace.org>
Cc: Arnd Bergmann <arnd@arndb.de>,
selinux@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] [v2] selinux: avoid uninitialized variable warning
Date: Mon, 25 Mar 2019 13:40:45 +0100 [thread overview]
Message-ID: <20190325124050.1285877-1-arnd@arndb.de> (raw)
clang correctly points out a code path that would lead
to an uninitialized variable use:
security/selinux/netlabel.c:310:6: error: variable 'addr' is used uninitialized whenever 'if' condition is false
[-Werror,-Wsometimes-uninitialized]
if (ip_hdr(skb)->version == 4) {
^~~~~~~~~~~~~~~~~~~~~~~~~
security/selinux/netlabel.c:322:40: note: uninitialized use occurs here
rc = netlbl_conn_setattr(ep->base.sk, addr, &secattr);
^~~~
security/selinux/netlabel.c:310:2: note: remove the 'if' if its condition is always true
if (ip_hdr(skb)->version == 4) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
security/selinux/netlabel.c:291:23: note: initialize the variable 'addr' to silence this warning
struct sockaddr *addr;
^
= NULL
This is probably harmless since we should not see ipv6 packets
of CONFIG_IPV6 is disabled, but it's better to rearrange the code
so this cannot happen.
Link: https://lore.kernel.org/patchwork/patch/1053663/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
v2: revise after discussing with Paul Moore
---
security/selinux/netlabel.c | 14 +++++---------
1 file changed, 5 insertions(+), 9 deletions(-)
diff --git a/security/selinux/netlabel.c b/security/selinux/netlabel.c
index 186e727b737b..fb4351733450 100644
--- a/security/selinux/netlabel.c
+++ b/security/selinux/netlabel.c
@@ -288,11 +288,8 @@ int selinux_netlbl_sctp_assoc_request(struct sctp_endpoint *ep,
int rc;
struct netlbl_lsm_secattr secattr;
struct sk_security_struct *sksec = ep->base.sk->sk_security;
- struct sockaddr *addr;
struct sockaddr_in addr4;
-#if IS_ENABLED(CONFIG_IPV6)
struct sockaddr_in6 addr6;
-#endif
if (ep->base.sk->sk_family != PF_INET &&
ep->base.sk->sk_family != PF_INET6)
@@ -310,16 +307,15 @@ int selinux_netlbl_sctp_assoc_request(struct sctp_endpoint *ep,
if (ip_hdr(skb)->version == 4) {
addr4.sin_family = AF_INET;
addr4.sin_addr.s_addr = ip_hdr(skb)->saddr;
- addr = (struct sockaddr *)&addr4;
-#if IS_ENABLED(CONFIG_IPV6)
- } else {
+ rc = netlbl_conn_setattr(ep->base.sk, (void*)&addr4, &secattr);
+ } else if (IS_ENABLED(CONFIG_IPV6)) {
addr6.sin6_family = AF_INET6;
addr6.sin6_addr = ipv6_hdr(skb)->saddr;
- addr = (struct sockaddr *)&addr6;
-#endif
+ rc = netlbl_conn_setattr(ep->base.sk, (void*)&addr6, &secattr);
+ } else {
+ rc = -EAFNOSUPPORT;
}
- rc = netlbl_conn_setattr(ep->base.sk, addr, &secattr);
if (rc == 0)
sksec->nlbl_state = NLBL_LABELED;
--
2.20.0
next reply other threads:[~2019-03-25 12:41 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-25 12:40 Arnd Bergmann [this message]
2019-03-25 14:14 ` [PATCH] [v2] selinux: avoid uninitialized variable warning Paul Moore
2019-03-25 14:24 ` Arnd Bergmann
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