Tighten behavior of _rs_allocate failure for portable arc4random implementations.

In the event of a failure in _rs_allocate for rsx, we still have a reference to
freed memory for rs on return. Not a huge deal since we subsequently abort in
_rs_init, but it looks strange on its own.
ok deraadt@

src/lib/libcrypto/arc4random/arc4random_aix.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: arc4random_aix.h,v 1.1 2015/03/30 11:29:48 bcook Exp $	*/
+/*	$OpenBSD: arc4random_aix.h,v 1.2 2016/06/30 12:19:51 bcook Exp $	*/
 
 /*
  * Copyright (c) 1996, David Mazieres <dm@uun.org>
@@ -72,6 +72,7 @@ _rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
 	if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE,
 	    MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) {
 		munmap(*rsp, sizeof(**rsp));
+		*rsp = NULL;
 		return (-1);
 	}
 

src/lib/libcrypto/arc4random/arc4random_freebsd.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: arc4random_freebsd.h,v 1.3 2015/09/11 11:52:55 deraadt Exp $	*/
+/*	$OpenBSD: arc4random_freebsd.h,v 1.4 2016/06/30 12:19:51 bcook Exp $	*/
 
 /*
  * Copyright (c) 1996, David Mazieres <dm@uun.org>
@@ -78,6 +78,7 @@ _rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
 	if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE,
 	    MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) {
 		munmap(*rsp, sizeof(**rsp));
+		*rsp = NULL;
 		return (-1);
 	}
 

src/lib/libcrypto/arc4random/arc4random_hpux.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: arc4random_hpux.h,v 1.2 2015/01/15 06:57:18 deraadt Exp $	*/
+/*	$OpenBSD: arc4random_hpux.h,v 1.3 2016/06/30 12:19:51 bcook Exp $	*/
 
 /*
  * Copyright (c) 1996, David Mazieres <dm@uun.org>
@@ -72,6 +72,7 @@ _rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
 	if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE,
 	    MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) {
 		munmap(*rsp, sizeof(**rsp));
+		*rsp = NULL;
 		return (-1);
 	}
 

src/lib/libcrypto/arc4random/arc4random_linux.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: arc4random_linux.h,v 1.10 2016/01/04 02:04:56 bcook Exp $	*/
+/*	$OpenBSD: arc4random_linux.h,v 1.11 2016/06/30 12:19:51 bcook Exp $	*/
 
 /*
  * Copyright (c) 1996, David Mazieres <dm@uun.org>
@@ -79,6 +79,7 @@ _rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
 	if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE,
 	    MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) {
 		munmap(*rsp, sizeof(**rsp));
+		*rsp = NULL;
 		return (-1);
 	}
 

src/lib/libcrypto/arc4random/arc4random_netbsd.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: arc4random_netbsd.h,v 1.2 2015/09/11 11:52:55 deraadt Exp $	*/
+/*	$OpenBSD: arc4random_netbsd.h,v 1.3 2016/06/30 12:19:51 bcook Exp $	*/
 
 /*
  * Copyright (c) 1996, David Mazieres <dm@uun.org>
@@ -78,6 +78,7 @@ _rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
 	if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE,
 	    MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) {
 		munmap(*rsp, sizeof(**rsp));
+		*rsp = NULL;
 		return (-1);
 	}
 

src/lib/libcrypto/arc4random/arc4random_osx.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: arc4random_osx.h,v 1.10 2015/09/11 11:52:55 deraadt Exp $	*/
+/*	$OpenBSD: arc4random_osx.h,v 1.11 2016/06/30 12:19:51 bcook Exp $	*/
 
 /*
  * Copyright (c) 1996, David Mazieres <dm@uun.org>
@@ -72,6 +72,7 @@ _rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
 	if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE,
 	    MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) {
 		munmap(*rsp, sizeof(**rsp));
+		*rsp = NULL;
 		return (-1);
 	}
 

src/lib/libcrypto/arc4random/arc4random_solaris.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: arc4random_solaris.h,v 1.9 2015/01/15 06:57:18 deraadt Exp $	*/
+/*	$OpenBSD: arc4random_solaris.h,v 1.10 2016/06/30 12:19:51 bcook Exp $	*/
 
 /*
  * Copyright (c) 1996, David Mazieres <dm@uun.org>
@@ -72,6 +72,7 @@ _rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
 	if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE,
 	    MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) {
 		munmap(*rsp, sizeof(**rsp));
+		*rsp = NULL;
 		return (-1);
 	}
 

src/lib/libcrypto/crypto/arc4random_aix.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: arc4random_aix.h,v 1.1 2015/03/30 11:29:48 bcook Exp $	*/
+/*	$OpenBSD: arc4random_aix.h,v 1.2 2016/06/30 12:19:51 bcook Exp $	*/
 
 /*
  * Copyright (c) 1996, David Mazieres <dm@uun.org>
@@ -72,6 +72,7 @@ _rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
 	if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE,
 	    MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) {
 		munmap(*rsp, sizeof(**rsp));
+		*rsp = NULL;
 		return (-1);
 	}
 

src/lib/libcrypto/crypto/arc4random_freebsd.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: arc4random_freebsd.h,v 1.3 2015/09/11 11:52:55 deraadt Exp $	*/
+/*	$OpenBSD: arc4random_freebsd.h,v 1.4 2016/06/30 12:19:51 bcook Exp $	*/
 
 /*
  * Copyright (c) 1996, David Mazieres <dm@uun.org>
@@ -78,6 +78,7 @@ _rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
 	if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE,
 	    MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) {
 		munmap(*rsp, sizeof(**rsp));
+		*rsp = NULL;
 		return (-1);
 	}
 

src/lib/libcrypto/crypto/arc4random_hpux.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: arc4random_hpux.h,v 1.2 2015/01/15 06:57:18 deraadt Exp $	*/
+/*	$OpenBSD: arc4random_hpux.h,v 1.3 2016/06/30 12:19:51 bcook Exp $	*/
 
 /*
  * Copyright (c) 1996, David Mazieres <dm@uun.org>
@@ -72,6 +72,7 @@ _rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
 	if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE,
 	    MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) {
 		munmap(*rsp, sizeof(**rsp));
+		*rsp = NULL;
 		return (-1);
 	}
 

src/lib/libcrypto/crypto/arc4random_linux.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: arc4random_linux.h,v 1.10 2016/01/04 02:04:56 bcook Exp $	*/
+/*	$OpenBSD: arc4random_linux.h,v 1.11 2016/06/30 12:19:51 bcook Exp $	*/
 
 /*
  * Copyright (c) 1996, David Mazieres <dm@uun.org>
@@ -79,6 +79,7 @@ _rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
 	if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE,
 	    MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) {
 		munmap(*rsp, sizeof(**rsp));
+		*rsp = NULL;
 		return (-1);
 	}
 

src/lib/libcrypto/crypto/arc4random_netbsd.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: arc4random_netbsd.h,v 1.2 2015/09/11 11:52:55 deraadt Exp $	*/
+/*	$OpenBSD: arc4random_netbsd.h,v 1.3 2016/06/30 12:19:51 bcook Exp $	*/
 
 /*
  * Copyright (c) 1996, David Mazieres <dm@uun.org>
@@ -78,6 +78,7 @@ _rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
 	if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE,
 	    MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) {
 		munmap(*rsp, sizeof(**rsp));
+		*rsp = NULL;
 		return (-1);
 	}
 

src/lib/libcrypto/crypto/arc4random_osx.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: arc4random_osx.h,v 1.10 2015/09/11 11:52:55 deraadt Exp $	*/
+/*	$OpenBSD: arc4random_osx.h,v 1.11 2016/06/30 12:19:51 bcook Exp $	*/
 
 /*
  * Copyright (c) 1996, David Mazieres <dm@uun.org>
@@ -72,6 +72,7 @@ _rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
 	if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE,
 	    MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) {
 		munmap(*rsp, sizeof(**rsp));
+		*rsp = NULL;
 		return (-1);
 	}
 

src/lib/libcrypto/crypto/arc4random_solaris.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: arc4random_solaris.h,v 1.9 2015/01/15 06:57:18 deraadt Exp $	*/
+/*	$OpenBSD: arc4random_solaris.h,v 1.10 2016/06/30 12:19:51 bcook Exp $	*/
 
 /*
  * Copyright (c) 1996, David Mazieres <dm@uun.org>
@@ -72,6 +72,7 @@ _rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
 	if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE,
 	    MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) {
 		munmap(*rsp, sizeof(**rsp));
+		*rsp = NULL;
 		return (-1);
 	}