libceph: align session_key and con_secret to 16 bytes

[linux-2.6-microblaze.git] / net / ceph / messenger_v2.c

diff --git a/net/ceph/messenger_v2.c b/net/ceph/messenger_v2.c
index 4f938fc..c38d8de 100644 (file)
--- a/net/ceph/messenger_v2.c
+++ b/net/ceph/messenger_v2.c
@@ -2033,10 +2033,18 @@ bad:
        return -EINVAL;
 }
 
+/*
+ * Align session_key and con_secret to avoid GFP_ATOMIC allocation
+ * inside crypto_shash_setkey() and crypto_aead_setkey() called from
+ * setup_crypto().  __aligned(16) isn't guaranteed to work for stack
+ * objects, so do it by hand.
+ */
 static int process_auth_done(struct ceph_connection *con, void *p, void *end)
 {
-       u8 session_key[CEPH_KEY_LEN];
-       u8 con_secret[CEPH_MAX_CON_SECRET_LEN];
+       u8 session_key_buf[CEPH_KEY_LEN + 16];
+       u8 con_secret_buf[CEPH_MAX_CON_SECRET_LEN + 16];
+       u8 *session_key = PTR_ALIGN(&session_key_buf[0], 16);
+       u8 *con_secret = PTR_ALIGN(&con_secret_buf[0], 16);
        int session_key_len, con_secret_len;
        int payload_len;
        u64 global_id;