From 3595807f4e36c3b809289cfbcc3bf3ff164b2303 Mon Sep 17 00:00:00 2001
From: "Todd C. Miller" <Todd.Miller@courtesan.com>
Date: Thu, 14 May 2015 10:13:18 -0600
Subject: [PATCH] Add reallocarray() for those without it.

---
 config.h.in           |  3 +++
 configure             |  3 +++
 configure.ac          |  2 +-
 include/sudo_compat.h |  7 ++++++-
 lib/util/alloc.c      | 15 +++++++++++++++
 5 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/config.h.in b/config.h.in
index 8f0b83b16..290dccc2f 100644
--- a/config.h.in
+++ b/config.h.in
@@ -556,6 +556,9 @@
 /* Define to 1 if you have the `random' function. */
 #undef HAVE_RANDOM
 
+/* Define to 1 if you have the `reallocarray' function. */
+#undef HAVE_REALLOCARRAY
+
 /* Define to 1 if you have the `revoke' function. */
 #undef HAVE_REVOKE
 
diff --git a/configure b/configure
index 4f1607499..6fb5e4991 100755
--- a/configure
+++ b/configure
@@ -2653,6 +2653,7 @@ as_fn_append ac_header_list " sys/stropts.h"
 as_fn_append ac_header_list " sys/sysmacros.h"
 as_fn_append ac_func_list " killpg"
 as_fn_append ac_func_list " nl_langinfo"
+as_fn_append ac_func_list " reallocarray"
 as_fn_append ac_func_list " strftime"
 as_fn_append ac_func_list " tzset"
 as_fn_append ac_func_list " seteuid"
@@ -17921,6 +17922,8 @@ done
 
 
 
+
+
 for ac_func in getgrouplist
 do :
   ac_fn_c_check_func "$LINENO" "getgrouplist" "ac_cv_func_getgrouplist"
diff --git a/configure.ac b/configure.ac
index 915347ada..d2be85ef9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2395,7 +2395,7 @@ dnl
 dnl Function checks
 dnl
 AC_FUNC_GETGROUPS
-AC_CHECK_FUNCS_ONCE([killpg nl_langinfo strftime tzset])
+AC_CHECK_FUNCS_ONCE([killpg nl_langinfo reallocarray strftime tzset])
 AC_CHECK_FUNCS([getgrouplist], [], [
     case "$host_os" in
     aix*)
diff --git a/include/sudo_compat.h b/include/sudo_compat.h
index 9d100a44f..fa8d6d7ff 100644
--- a/include/sudo_compat.h
+++ b/include/sudo_compat.h
@@ -368,7 +368,7 @@ __dso_public long long sudo_strtonum(const char *, long long, long long, const c
  * All libc replacements are prefixed with "sudo_" to avoid namespace issues.
  */
 
-struct timeval;
+struct passwd;
 struct timespec;
 
 #ifndef HAVE_CLOSEFROM
@@ -479,5 +479,10 @@ __dso_public const char *sudo_getprogname(void);
 # undef getprogname
 # define getprogname() sudo_getprogname()
 #endif /* HAVE_GETPROGNAME */
+#ifndef HAVE_REALLOCARRAY
+__dso_public void *sudo_reallocarray(void *ptr, size_t nmemb, size_t size);
+# undef reallocarray
+# define reallocarray(_a, _b, _c) sudo_reallocarray((_a), (_b), (_c))
+#endif /* HAVE_REALLOCARRAY */
 
 #endif /* _SUDO_COMPAT_H */
diff --git a/lib/util/alloc.c b/lib/util/alloc.c
index f94c04bd7..5f2208d52 100644
--- a/lib/util/alloc.c
+++ b/lib/util/alloc.c
@@ -48,6 +48,7 @@
 #elif defined(HAVE_INTTYPES_H)
 # include <inttypes.h>
 #endif
+#include <errno.h>
 #include <limits.h>
 
 #define DEFAULT_TEXT_DOMAIN	"sudo"
@@ -257,3 +258,17 @@ sudo_evasprintf_v1(char **ret, const char *fmt, va_list args)
 	sudo_fatal_nodebug(NULL);
     return len;
 }
+
+#ifndef HAVE_REALLOCARRAY
+void *
+sudo_reallocarray(void *ptr, size_t nmemb, size_t size)
+{
+    if (nmemb > SIZE_MAX / size) {
+	errno = EOVERFLOW;
+	return NULL;
+    }
+
+    size *= nmemb;
+    return ptr ? realloc(ptr, size) : malloc(size);
+}
+#endif /* HAVE_REALLOCARRAY */
-- 
2.50.1