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ceph: ensure auth ops are defined before use 

In the create_authorizer method for both the mds and osd clients,
the auth_client->ops pointer is blindly dereferenced.  There is no
obvious guarantee that this pointer has been assigned.  And
furthermore, even if the ops pointer is non-null there is definitely
no guarantee that the create_authorizer or destroy_authorizer
methods are defined.

Add checks in both routines to make sure they are defined (non-null)
before use.  Add similar checks in a few other spots in these files
while we're at it.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
This commit is contained in:
Alex Elder 2012-05-16 15:16:39 -05:00 committed by Alex Elder
parent 74f1869f76
commit a255651d4c
2 changed files with 16 additions and 13 deletions
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14
fs/ceph/mds_client.c
View File

@ -3406,16 +3406,14 @@ static int get_authorizer(struct ceph_connection *con,
int ret = 0;
if (force_new && auth->authorizer) {
ac->ops->destroy_authorizer(ac, auth->authorizer);
if (ac->ops && ac->ops->destroy_authorizer)
ac->ops->destroy_authorizer(ac, auth->authorizer);
auth->authorizer = NULL;
}
if (auth->authorizer == NULL) {
if (ac->ops->create_authorizer) {
ret = ac->ops->create_authorizer(ac,
CEPH_ENTITY_TYPE_MDS, auth);
if (ret)
return ret;
}
if (!auth->authorizer && ac->ops && ac->ops->create_authorizer) {
ret = ac->ops->create_authorizer(ac, CEPH_ENTITY_TYPE_MDS, auth);
if (ret)
return ret;
}
*proto = ac->protocol;

15
net/ceph/osd_client.c
View File

@ -664,10 +664,10 @@ static void put_osd(struct ceph_osd *osd)
{
dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
atomic_read(&osd->o_ref) - 1);
if (atomic_dec_and_test(&osd->o_ref)) {
if (atomic_dec_and_test(&osd->o_ref) && osd->o_auth.authorizer) {
struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
if (osd->o_auth.authorizer)
if (ac->ops && ac->ops->destroy_authorizer)
ac->ops->destroy_authorizer(ac, osd->o_auth.authorizer);
kfree(osd);
}
@ -2119,10 +2119,11 @@ static int get_authorizer(struct ceph_connection *con,
int ret = 0;
if (force_new && auth->authorizer) {
ac->ops->destroy_authorizer(ac, auth->authorizer);
if (ac->ops && ac->ops->destroy_authorizer)
ac->ops->destroy_authorizer(ac, auth->authorizer);
auth->authorizer = NULL;
}
if (auth->authorizer == NULL) {
if (!auth->authorizer && ac->ops && ac->ops->create_authorizer) {
ret = ac->ops->create_authorizer(ac, CEPH_ENTITY_TYPE_OSD, auth);
if (ret)
return ret;
@ -2144,6 +2145,10 @@ static int verify_authorizer_reply(struct ceph_connection *con, int len)
struct ceph_osd_client *osdc = o->o_osdc;
struct ceph_auth_client *ac = osdc->client->monc.auth;
/*
* XXX If ac->ops or ac->ops->verify_authorizer_reply is null,
* XXX which do we do: succeed or fail?
*/
return ac->ops->verify_authorizer_reply(ac, o->o_auth.authorizer, len);
}
@ -2153,7 +2158,7 @@ static int invalidate_authorizer(struct ceph_connection *con)
struct ceph_osd_client *osdc = o->o_osdc;
struct ceph_auth_client *ac = osdc->client->monc.auth;
if (ac->ops->invalidate_authorizer)
if (ac->ops && ac->ops->invalidate_authorizer)
ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
return ceph_monc_validate_auth(&osdc->client->monc);