From 6e8c751e07b34d73069e9333f67fbe5ffe31ec3a Mon Sep 17 00:00:00 2001 From: Chad Sellers <csellers@tresys.com> Date: Fri, 6 Oct 2006 16:09:52 -0400 Subject: [PATCH] SELinux: Bug fix in polidydb_destroy This patch fixes two bugs in policydb_destroy. Two list pointers (policydb.ocontexts[i] and policydb.genfs) were not being reset to NULL when the lists they pointed to were being freed. This caused a problem when the initial policy load failed, as the policydb being destroyed was not a temporary new policydb that was thrown away, but rather was the global (active) policydb. Consequently, later functions, particularly sys_bind->selinux_socket_bind->security_node_sid and do_rw_proc->selinux_sysctl->selinux_proc_get_sid->security_genfs_sid tried to dereference memory that had previously been freed. Signed-off-by: Chad Sellers <csellers@tresys.com> Signed-off-by: James Morris <jmorris@namei.org> --- security/selinux/ss/policydb.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c index b18895302555..ba48961f9d05 100644 --- a/security/selinux/ss/policydb.c +++ b/security/selinux/ss/policydb.c @@ -618,6 +618,7 @@ void policydb_destroy(struct policydb *p) c = c->next; ocontext_destroy(ctmp,i); } + p->ocontexts[i] = NULL; } g = p->genfs; @@ -633,6 +634,7 @@ void policydb_destroy(struct policydb *p) g = g->next; kfree(gtmp); } + p->genfs = NULL; cond_policydb_destroy(p); -- GitLab