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sunrpc: clean up properly in gss_mech_unregister() 

gss_mech_register() calls svcauth_gss_register_pseudoflavor() for each
flavour, but gss_mech_unregister() does not call auth_domain_put().
This is unbalanced and makes it impossible to reload the module.

Change svcauth_gss_register_pseudoflavor() to return the registered
auth_domain, and save it for later release.

Cc: stable@vger.kernel.org (v2.6.12+)
Link: https://bugzilla.kernel.org/show_bug.cgi?id=206651
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
NeilBrown 2020-05-22 12:01:33 +10:00 committed by J. Bruce Fields
parent d47a5dc288
commit 24c5efe41c
4 changed files with 18 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/sunrpc/gss_api.h
View File

@ -84,6 +84,7 @@ struct pf_desc {
u32 service;
char *name;
char *auth_domain_name;
struct auth_domain *domain;
bool datatouch;
};

3
include/linux/sunrpc/svcauth_gss.h
View File

@ -20,7 +20,8 @@ int gss_svc_init(void);
void gss_svc_shutdown(void);
int gss_svc_init_net(struct net *net);
void gss_svc_shutdown_net(struct net *net);
int svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name);
struct auth_domain *svcauth_gss_register_pseudoflavor(u32 pseudoflavor,
char *name);
u32 svcauth_gss_flavor(struct auth_domain *dom);
#endif /* _LINUX_SUNRPC_SVCAUTH_GSS_H */

12
net/sunrpc/auth_gss/gss_mech_switch.c
View File

@ -37,6 +37,8 @@ gss_mech_free(struct gss_api_mech *gm)
for (i = 0; i < gm->gm_pf_num; i++) {
pf = &gm->gm_pfs[i];
if (pf->domain)
auth_domain_put(pf->domain);
kfree(pf->auth_domain_name);
pf->auth_domain_name = NULL;
}
@ -59,6 +61,7 @@ make_auth_domain_name(char *name)
static int
gss_mech_svc_setup(struct gss_api_mech *gm)
{
struct auth_domain *dom;
struct pf_desc *pf;
int i, status;
@ -68,11 +71,14 @@ gss_mech_svc_setup(struct gss_api_mech *gm)
status = -ENOMEM;
if (pf->auth_domain_name == NULL)
goto out;
status = svcauth_gss_register_pseudoflavor(pf->pseudoflavor,
pf->auth_domain_name);
if (status)
dom = svcauth_gss_register_pseudoflavor(
pf->pseudoflavor, pf->auth_domain_name);
if (IS_ERR(dom)) {
status = PTR_ERR(dom);
goto out;
}
pf->domain = dom;
}
return 0;
out:
gss_mech_free(gm);

12
net/sunrpc/auth_gss/svcauth_gss.c
View File

@ -809,7 +809,7 @@ u32 svcauth_gss_flavor(struct auth_domain *dom)
EXPORT_SYMBOL_GPL(svcauth_gss_flavor);
int
struct auth_domain *
svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
{
struct gss_domain *new;
@ -832,17 +832,17 @@ svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
name);
stat = -EADDRINUSE;
auth_domain_put(test);
kfree(new->h.name);
goto out_free_dom;
goto out_free_name;
}
return 0;
return test;
out_free_name:
kfree(new->h.name);
out_free_dom:
kfree(new);
out:
return stat;
return ERR_PTR(stat);
}
EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor);
static inline int