kc3-lang/libressl/crypto/compat/crypto_lock_win.c

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• Hash : 1e848d2e
  Author :
  Date : 2019-01-04T19:24:59
  

  Handle malloc returning null
  
  Locks are required for multi-threading. If memory can't be allocated, exit the program with memory error. If we let the program continue, it will deadlock in the next part of the code anyway so better end it before.

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• crypto/compat/crypto_lock_win.c

• /* $OpenBSD: crypto_lock.c,v 1.1 2018/11/11 06:41:28 bcook Exp $ */
  /*
   * Copyright (c) 2019 Brent Cook <bcook@openbsd.org>
   * Copyright (c) 2019 John Norrbin <jlnorrbin@johnex.se>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <windows.h>
  
  #include <openssl/crypto.h>
  
  static volatile LPCRITICAL_SECTION locks[CRYPTO_NUM_LOCKS] = { NULL };
  
  void
  CRYPTO_lock(int mode, int type, const char *file, int line)
  {
  	if (type < 0 || type >= CRYPTO_NUM_LOCKS)
  		return;
  
  	if (locks[type] == NULL) {
  		LPCRITICAL_SECTION lcs = malloc(sizeof(CRITICAL_SECTION));
  		if (lcs == NULL) exit(ENOMEM);
  		InitializeCriticalSection(lcs);
  		if (InterlockedCompareExchangePointer((PVOID*)&locks[type], (PVOID)lcs, NULL) != NULL) {
  			DeleteCriticalSection(lcs);
  			free(lcs);
  		}
  	}
  
  	if (mode & CRYPTO_LOCK)
  		EnterCriticalSection(locks[type]);
  	else
  		LeaveCriticalSection(locks[type]);
  }
  
  int
  CRYPTO_add_lock(int *pointer, int amount, int type, const char *file,
      int line)
  {
  	/*
  	 * Windows is LLP64. sizeof(LONG) == sizeof(int) on 32-bit and 64-bit.
  	 */
  	int ret = InterlockedExchangeAdd((LONG *)pointer, (LONG)amount);
  	return ret + amount;
  }
  

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