Comment correction.

[openssl.git] / crypto / ex_data.c

diff --git a/crypto/ex_data.c b/crypto/ex_data.c
index a057dd3b686a9a086df55031cd7419d96e5507ce..ff32ad5be6b35ed724b4ada6bff2c9e8b555d883 100644 (file)
--- a/crypto/ex_data.c
+++ b/crypto/ex_data.c
@@ -1,4 +1,19 @@
 /* crypto/ex_data.c */
+
+/*
+ * This is not thread-safe, nor can it be changed to become thread-safe
+ * without changing various function prototypes and using a lot of locking.
+ * Luckily, it's not really used anywhere except in ssl_verify_cert_chain
+ * via SSL_get_ex_data_X509_STORE_CTX_idx (ssl/ssl_cert.c),
+ * where new_func, dup_func, and free_func all are 0, and in
+ * hwcrhk_init (crypto/engine/hw_ncipher.c), which is hopefully only
+ * ever used during program initialization.
+ *
+ * Any multi-threaded application crazy enough to use ex_data for its own
+ * purposes had better make sure that SSL_get_ex_data_X509_STORE_CTX_idx
+ * is called once before multiple threads are created.
+ */
+
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -77,7 +92,7 @@ int CRYPTO_get_ex_new_index(int idx, STACK_OF(CRYPTO_EX_DATA_FUNCS) **skp, long
                CRYPTOerr(CRYPTO_F_CRYPTO_GET_EX_NEW_INDEX,ERR_R_MALLOC_FAILURE);
                goto err;
                }
-       a=(CRYPTO_EX_DATA_FUNCS *)Malloc(sizeof(CRYPTO_EX_DATA_FUNCS));
+       a=(CRYPTO_EX_DATA_FUNCS *)OPENSSL_malloc(sizeof(CRYPTO_EX_DATA_FUNCS));
        if (a == NULL)
                {
                CRYPTOerr(CRYPTO_F_CRYPTO_GET_EX_NEW_INDEX,ERR_R_MALLOC_FAILURE);
@@ -93,7 +108,7 @@ int CRYPTO_get_ex_new_index(int idx, STACK_OF(CRYPTO_EX_DATA_FUNCS) **skp, long
                if (!sk_CRYPTO_EX_DATA_FUNCS_push(*skp,NULL))
                        {
                        CRYPTOerr(CRYPTO_F_CRYPTO_GET_EX_NEW_INDEX,ERR_R_MALLOC_FAILURE);
-                       Free(a);
+                       OPENSSL_free(a);
                        goto err;
                        }
                }
@@ -101,7 +116,7 @@ int CRYPTO_get_ex_new_index(int idx, STACK_OF(CRYPTO_EX_DATA_FUNCS) **skp, long
        ret=idx;
 err:
        MemCheck_on();
-       return(idx);
+       return(ret);
        }
 
 int CRYPTO_set_ex_data(CRYPTO_EX_DATA *ad, int idx, void *val)
@@ -131,7 +146,7 @@ int CRYPTO_set_ex_data(CRYPTO_EX_DATA *ad, int idx, void *val)
        return(1);
        }
 
-void *CRYPTO_get_ex_data(CRYPTO_EX_DATA *ad, int idx)
+void *CRYPTO_get_ex_data(const CRYPTO_EX_DATA *ad, int idx)
        {
        if (ad->sk == NULL)
                return(0);