Reloading rpcsec_gss_krb5 or rpcsec_gss_spkm3 hit duplicate
registration in svcauth_gss_register_pseudoflavor().
(If DEBUG_PAGEALLOC is enabled, oops will happen at
auth_domain_put() --> hlist_del() with uninitialized hlist_node)
svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
{
...
test = auth_domain_lookup(name, &new->h);
if (test != &new->h) { /* XXX Duplicate registration? */
auth_domain_put(&new->h);
/* dangling ref-count... */
...
}
This patch unregisters gss_domain and free it when unloading
modules (rpcsec_gss_krb5 or rpcsec_gss_spkm3 module call
gss_mech_unregister())
Cc: Andy Adamson <[email protected]>
Cc: "J. Bruce Fields" <[email protected]>
Cc: Trond Myklebust <[email protected]>
Signed-off-by: Akinobu Mita <[email protected]>
net/sunrpc/auth_gss/gss_mech_switch.c | 4 ++++
net/sunrpc/auth_gss/svcauth_gss.c | 6 +++---
2 files changed, 7 insertions(+), 3 deletions(-)
Index: work-fault-inject/net/sunrpc/auth_gss/gss_mech_switch.c
===================================================================
--- work-fault-inject.orig/net/sunrpc/auth_gss/gss_mech_switch.c
+++ work-fault-inject/net/sunrpc/auth_gss/gss_mech_switch.c
@@ -59,7 +59,11 @@ gss_mech_free(struct gss_api_mech *gm)
int i;
for (i = 0; i < gm->gm_pf_num; i++) {
+ struct auth_domain *dom;
+
pf = &gm->gm_pfs[i];
+ dom = auth_domain_find(pf->auth_domain_name);
+ auth_domain_put(dom);
kfree(pf->auth_domain_name);
pf->auth_domain_name = NULL;
}
Index: work-fault-inject/net/sunrpc/auth_gss/svcauth_gss.c
===================================================================
--- work-fault-inject.orig/net/sunrpc/auth_gss/svcauth_gss.c
+++ work-fault-inject/net/sunrpc/auth_gss/svcauth_gss.c
@@ -765,9 +765,9 @@ svcauth_gss_register_pseudoflavor(u32 ps
test = auth_domain_lookup(name, &new->h);
if (test != &new->h) { /* XXX Duplicate registration? */
- auth_domain_put(&new->h);
- /* dangling ref-count... */
- goto out;
+ WARN_ON(1);
+ kfree(new->h.name);
+ goto out_free_dom;
}
return 0;
-
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