[PATCH 5.10 09/48] selinux: initialize proto variable in selinux_ip_postroute_compat()

From: Greg Kroah-Hartman
Date: Mon Jan 03 2022 - 09:31:48 EST


From: Tom Rix <trix@xxxxxxxxxx>

commit 732bc2ff080c447f8524f40c970c481f5da6eed3 upstream.

Clang static analysis reports this warning

hooks.c:5765:6: warning: 4th function call argument is an uninitialized
value
if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

selinux_parse_skb() can return ok without setting proto. The later call
to selinux_xfrm_postroute_last() does an early check of proto and can
return ok if the garbage proto value matches. So initialize proto.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: eef9b41622f2 ("selinux: cleanup selinux_xfrm_sock_rcv_skb() and selinux_xfrm_postroute_last()")
Signed-off-by: Tom Rix <trix@xxxxxxxxxx>
[PM: typo/spelling and checkpatch.pl description fixes]
Signed-off-by: Paul Moore <paul@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
security/selinux/hooks.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -5665,7 +5665,7 @@ static unsigned int selinux_ip_postroute
struct common_audit_data ad;
struct lsm_network_audit net = {0,};
char *addrp;
- u8 proto;
+ u8 proto = 0;

if (sk == NULL)
return NF_ACCEPT;