[PATCH] audit: skip sessionid sentinel value when auto-incrementing

[Richard Guy Briggs]

The value (unsigned int)-1 is used as a sentinel to indicate the
sessionID is unset.  Skip this value when the session_id value wraps.

Signed-off-by: Richard Guy Briggs <r...@redhat.com>
---
 kernel/auditsc.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 5abf1dc..e414dfa 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -2025,8 +2025,11 @@ int audit_set_loginuid(kuid_t loginuid)
                goto out;
 
        /* are we setting or clearing? */
-       if (uid_valid(loginuid))
+       if (uid_valid(loginuid)) {
                sessionid = (unsigned int)atomic_inc_return(&session_id);
+               if (unlikely(sessionid == (unsigned int)-1))
+                       sessionid = (unsigned 
int)atomic_inc_return(&session_id);
+       }
 
        task->sessionid = sessionid;
        task->loginuid = loginuid;
-- 
1.7.1