nx-X11/{config/cf/{{Imake,X11}.tmpl,linux.cf},programs/Xserver/{include/os.h,os/{Imakefile,reallocarray.c}}: backport reallocarray() implementation.

3 files changed, 56 insertions, 2 deletions

diff --git a/nx-X11/programs/Xserver/include/os.h b/nx-X11/programs/Xserver/include/os.h
index a53f0d4c8..a8ef1896d 100644
--- a/nx-X11/programs/Xserver/include/os.h
+++ b/nx-X11/programs/Xserver/include/os.h
@@ -448,6 +448,12 @@ extern void AbortDDX(void);
 extern void ddxGiveUp(void);
 extern int TimeSinceLastInputEvent(void);
 
+#ifndef HAVE_REALLOCARRAY
+#define reallocarray xreallocarray
+extern _X_EXPORT void *
+reallocarray(void *optr, size_t nmemb, size_t size);
+#endif
+
 #ifndef HAVE_STRLCPY
 extern _X_EXPORT size_t
 strlcpy(char *dst, const char *src, size_t siz);
diff --git a/nx-X11/programs/Xserver/os/Imakefile b/nx-X11/programs/Xserver/os/Imakefile
index 26d9c6dff..2abc1aff9 100644
--- a/nx-X11/programs/Xserver/os/Imakefile
+++ b/nx-X11/programs/Xserver/os/Imakefile
@@ -102,6 +102,11 @@ STRLCAT_SRCS = strlcat.c strlcpy.c
 STRLCAT_OBJS = strlcat.o strlcpy.o
 #endif
 
+#if !HasReallocarray
+REALLOCARRAY_SRCS = reallocarray.c
+REALLOCARRAY_OBJS = reallocarray.o
+#endif
+
 #if HasGetpeerucred
 GETPEER_DEFINES = -DHAS_GETPEERUCRED
 #else
@@ -115,12 +120,12 @@ BOOTSTRAPCFLAGS =
                   osinit.c utils.c log.c auth.c mitauth.c secauth.c \
                   $(XDMAUTHSRCS) $(RPCSRCS) xdmcp.c OtherSources \
                   xstrans.c $(SNPRINTF_SRCS) $(STRLCAT_SRCS) \
-		  xprintf.c
+		  $(REALLOCARRAY_SRCS) xprintf.c
            OBJS = WaitFor.o access.o connection.o io.o $(COLOR_OBJS) \
                   osinit.o utils.o log.o auth.o mitauth.o secauth.o \
                   $(XDMAUTHOBJS) $(RPCOBJS) xdmcp.o OtherObjects \
                   xstrans.o $(SNPRINTF_OBJS) $(STRLCAT_OBJS) \
-		  xprintf.o
+		  $(REALLOCARRAY_OBJS) xprintf.o
 
 #if UseMemLeak
      MEM_DEFINES = -DMEMBUG
diff --git a/nx-X11/programs/Xserver/os/reallocarray.c b/nx-X11/programs/Xserver/os/reallocarray.c
new file mode 100644
index 000000000..c415e09af
--- /dev/null
+++ b/nx-X11/programs/Xserver/os/reallocarray.c
@@ -0,0 +1,43 @@
+/*	$OpenBSD: reallocarray.c,v 1.2 2014/12/08 03:45:00 bcook Exp $	*/
+/*
+ * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>
+ *
+ * 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.
+ */
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include <sys/types.h>
+#include <errno.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include "os.h"
+
+/*
+ * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
+ * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW
+ */
+#define MUL_NO_OVERFLOW	((size_t)1 << (sizeof(size_t) * 4))
+
+void *
+reallocarray(void *optr, size_t nmemb, size_t size)
+{
+	if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
+	    nmemb > 0 && SIZE_MAX / nmemb < size) {
+		errno = ENOMEM;
+		return NULL;
+	}
+	return realloc(optr, size * nmemb);
+}