1 files changed, 39 insertions, 15 deletions

diff --git a/fs/ceph/auth_x.c b/fs/ceph/auth_x.c
index f0318427b6da..d9001a4dc8cc 100644
--- a/fs/ceph/auth_x.c
+++ b/fs/ceph/auth_x.c
@@ -4,6 +4,7 @@
 #include <linux/err.h>
 #include <linux/module.h>
 #include <linux/random.h>
+#include <linux/slab.h>
 
 #include "auth_x.h"
 #include "auth_x_protocol.h"
@@ -28,6 +29,12 @@ static int ceph_x_is_authenticated(struct ceph_auth_client *ac)
         return (ac->want_keys & xi->have_keys) == ac->want_keys;
 }
 
+static int ceph_x_encrypt_buflen(int ilen)
+{
+        return sizeof(struct ceph_x_encrypt_header) + ilen + 16 +
+                sizeof(u32);
+}
+
 static int ceph_x_encrypt(struct ceph_crypto_key *secret,
                           void *ibuf, int ilen, void *obuf, size_t olen)
 {
@@ -150,6 +157,11 @@ static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
                 struct timespec validity;
                 struct ceph_crypto_key old_key;
                 void *tp, *tpend;
+                struct ceph_timespec new_validity;
+                struct ceph_crypto_key new_session_key;
+                struct ceph_buffer *new_ticket_blob;
+                unsigned long new_expires, new_renew_after;
+                u64 new_secret_id;
 
                 ceph_decode_need(&p, end, sizeof(u32) + 1, bad);
 
@@ -182,16 +194,16 @@ static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
                         goto bad;
 
                 memcpy(&old_key, &th->session_key, sizeof(old_key));
-                ret = ceph_crypto_key_decode(&th->session_key, &dp, dend);
+                ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
                 if (ret)
                         goto out;
 
-                ceph_decode_copy(&dp, &th->validity, sizeof(th->validity));
-                ceph_decode_timespec(&validity, &th->validity);
-                th->expires = get_seconds() + validity.tv_sec;
-                th->renew_after = th->expires - (validity.tv_sec / 4);
-                dout(" expires=%lu renew_after=%lu\n", th->expires,
-                     th->renew_after);
+                ceph_decode_copy(&dp, &new_validity, sizeof(new_validity));
+                ceph_decode_timespec(&validity, &new_validity);
+                new_expires = get_seconds() + validity.tv_sec;
+                new_renew_after = new_expires - (validity.tv_sec / 4);
+                dout(" expires=%lu renew_after=%lu\n", new_expires,
+                     new_renew_after);
 
                 /* ticket blob for service */
                 ceph_decode_8_safe(&p, end, is_enc, bad);
@@ -216,10 +228,21 @@ static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
                 dout(" ticket blob is %d bytes\n", dlen);
                 ceph_decode_need(&tp, tpend, 1 + sizeof(u64), bad);
                 struct_v = ceph_decode_8(&tp);
-                th->secret_id = ceph_decode_64(&tp);
-                ret = ceph_decode_buffer(&th->ticket_blob, &tp, tpend);
+                new_secret_id = ceph_decode_64(&tp);
+                ret = ceph_decode_buffer(&new_ticket_blob, &tp, tpend);
                 if (ret)
                         goto out;
+
+                /* all is well, update our ticket */
+                ceph_crypto_key_destroy(&th->session_key);
+                if (th->ticket_blob)
+                        ceph_buffer_put(th->ticket_blob);
+                th->session_key = new_session_key;
+                th->ticket_blob = new_ticket_blob;
+                th->validity = new_validity;
+                th->secret_id = new_secret_id;
+                th->expires = new_expires;
+                th->renew_after = new_renew_after;
                 dout(" got ticket service %d (%s) secret_id %lld len %d\n",
                      type, ceph_entity_type_name(type), th->secret_id,
                      (int)th->ticket_blob->vec.iov_len);
@@ -242,7 +265,7 @@ static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
                                    struct ceph_x_ticket_handler *th,
                                    struct ceph_x_authorizer *au)
 {
-        int len;
+        int maxlen;
         struct ceph_x_authorize_a *msg_a;
         struct ceph_x_authorize_b msg_b;
         void *p, *end;
@@ -253,15 +276,15 @@ static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
         dout("build_authorizer for %s %p\n",
              ceph_entity_type_name(th->service), au);
 
-        len = sizeof(*msg_a) + sizeof(msg_b) + sizeof(u32) +
-                ticket_blob_len + 16;
-        dout("  need len %d\n", len);
-        if (au->buf && au->buf->alloc_len < len) {
+        maxlen = sizeof(*msg_a) + sizeof(msg_b) +
+                ceph_x_encrypt_buflen(ticket_blob_len);
+        dout("  need len %d\n", maxlen);
+        if (au->buf && au->buf->alloc_len < maxlen) {
                 ceph_buffer_put(au->buf);
                 au->buf = NULL;
         }
         if (!au->buf) {
-                au->buf = ceph_buffer_new(len, GFP_NOFS);
+                au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
                 if (!au->buf)
                         return -ENOMEM;
         }
@@ -296,6 +319,7 @@ static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
         au->buf->vec.iov_len = p - au->buf->vec.iov_base;
         dout(" built authorizer nonce %llx len %d\n", au->nonce,
              (int)au->buf->vec.iov_len);
+        BUG_ON(au->buf->vec.iov_len > maxlen);
         return 0;
 
 out_buf: