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authorIlya Dryomov <idryomov@gmail.com>2015-10-26 13:03:46 +0300
committerIlya Dryomov <idryomov@gmail.com>2015-11-03 01:36:48 +0300
commitcbf99a11fb14db0835acd79ecd7469d37e398660 (patch)
tree6d9b61ad72fd9cecd013e2dd70388d55e6491a9d
parent5e804ac4824302efc3038e086cb21f2e93ab8900 (diff)
downloadlinux-cbf99a11fb14db0835acd79ecd7469d37e398660.tar.xz
libceph: introduce ceph_x_authorizer_cleanup()
Commit ae385eaf24dc ("libceph: store session key in cephx authorizer") introduced ceph_x_authorizer::session_key, but didn't update all the exit/error paths. Introduce ceph_x_authorizer_cleanup() to encapsulate ceph_x_authorizer cleanup and switch to it. This fixes ceph_x_destroy(), which currently always leaks key and ceph_x_build_authorizer() error paths. Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Yan, Zheng <zyan@redhat.com>
-rw-r--r--net/ceph/auth_x.c28
-rw-r--r--net/ceph/crypto.h4
2 files changed, 20 insertions, 12 deletions
diff --git a/net/ceph/auth_x.c b/net/ceph/auth_x.c
index ba6eb17226da..65054fd31b97 100644
--- a/net/ceph/auth_x.c
+++ b/net/ceph/auth_x.c
@@ -279,6 +279,15 @@ bad:
return -EINVAL;
}
+static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au)
+{
+ ceph_crypto_key_destroy(&au->session_key);
+ if (au->buf) {
+ ceph_buffer_put(au->buf);
+ au->buf = NULL;
+ }
+}
+
static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
struct ceph_x_ticket_handler *th,
struct ceph_x_authorizer *au)
@@ -297,7 +306,7 @@ static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
ceph_crypto_key_destroy(&au->session_key);
ret = ceph_crypto_key_clone(&au->session_key, &th->session_key);
if (ret)
- return ret;
+ goto out_au;
maxlen = sizeof(*msg_a) + sizeof(msg_b) +
ceph_x_encrypt_buflen(ticket_blob_len);
@@ -309,8 +318,8 @@ static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
if (!au->buf) {
au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
if (!au->buf) {
- ceph_crypto_key_destroy(&au->session_key);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto out_au;
}
}
au->service = th->service;
@@ -340,7 +349,7 @@ static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
ret = ceph_x_encrypt(&au->session_key, &msg_b, sizeof(msg_b),
p, end - p);
if (ret < 0)
- goto out_buf;
+ goto out_au;
p += ret;
au->buf->vec.iov_len = p - au->buf->vec.iov_base;
dout(" built authorizer nonce %llx len %d\n", au->nonce,
@@ -348,9 +357,8 @@ static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
BUG_ON(au->buf->vec.iov_len > maxlen);
return 0;
-out_buf:
- ceph_buffer_put(au->buf);
- au->buf = NULL;
+out_au:
+ ceph_x_authorizer_cleanup(au);
return ret;
}
@@ -624,8 +632,7 @@ static void ceph_x_destroy_authorizer(struct ceph_auth_client *ac,
{
struct ceph_x_authorizer *au = (void *)a;
- ceph_crypto_key_destroy(&au->session_key);
- ceph_buffer_put(au->buf);
+ ceph_x_authorizer_cleanup(au);
kfree(au);
}
@@ -653,8 +660,7 @@ static void ceph_x_destroy(struct ceph_auth_client *ac)
remove_ticket_handler(ac, th);
}
- if (xi->auth_authorizer.buf)
- ceph_buffer_put(xi->auth_authorizer.buf);
+ ceph_x_authorizer_cleanup(&xi->auth_authorizer);
kfree(ac->private);
ac->private = NULL;
diff --git a/net/ceph/crypto.h b/net/ceph/crypto.h
index d1498224c49d..2e9cab09f37b 100644
--- a/net/ceph/crypto.h
+++ b/net/ceph/crypto.h
@@ -16,8 +16,10 @@ struct ceph_crypto_key {
static inline void ceph_crypto_key_destroy(struct ceph_crypto_key *key)
{
- if (key)
+ if (key) {
kfree(key->key);
+ key->key = NULL;
+ }
}
int ceph_crypto_key_clone(struct ceph_crypto_key *dst,