Fix possible login(1) argument injection in telnetd(8). [SA-16:36]

Fix link_ntoa(3) buffer overflow in libc. [SA-16:37]
Fix warnings about valid time zone abbreviations. [EN-16:19]
Update timezone database information. [EN-16:20]

Security:	FreeBSD-SA-16:36.telnetd
Security:	FreeBSD-SA-16:37.libc
Errata Notice:	FreeBSD-EN-16:19.tzcode
Errata Notice:	FreeBSD-EN-16:20.tzdata
Approved by:	so

4 files changed, 49 insertions, 21 deletions

diff --git a/UPDATING b/UPDATING
index 639ab76bbb22..874627a86667 100644
--- a/UPDATING
+++ b/UPDATING
@@ -11,6 +11,16 @@ handbook:
 Items affecting the ports and packages system can be found in
 /usr/ports/UPDATING.  Please read that file before running portupgrade.
 
+20161206	p51	FreeBSD-SA-16:36.telnetd
+			FreeBSD-SA-16:37.libc
+			FreeBSD-EN-16:19.tzcode
+			FreeBSD-EN-16:20.tzdata
+
+	Fix possible login(1) argument injection in telnetd(8). [SA-16:36]
+	Fix link_ntoa(3) buffer overflow in libc. [SA-16:37]
+	Fix warnings about valid time zone abbreviations. [EN-16:19]
+	Update timezone database information. [EN-16:20]
+
 20161102	p50	FreeBSD-SA-16:34.bind
 			FreeBSD-SA-16:35.openssl
 
diff --git a/contrib/telnet/telnetd/sys_term.c b/contrib/telnet/telnetd/sys_term.c
index a7b0075f387d..fa7050d68ef0 100644
--- a/contrib/telnet/telnetd/sys_term.c
+++ b/contrib/telnet/telnetd/sys_term.c
@@ -1211,7 +1211,7 @@ addarg(char **argv, const char *val)
 		 */
 		argv = (char **)malloc(sizeof(*argv) * 12);
 		if (argv == NULL)
-			return(NULL);
+			fatal(net, "failure allocating argument space");
 		*argv++ = (char *)10;
 		*argv = (char *)0;
 	}
@@ -1222,11 +1222,12 @@ addarg(char **argv, const char *val)
 		*argv = (char *)((long)(*argv) + 10);
 		argv = (char **)realloc(argv, sizeof(*argv)*((long)(*argv) + 2));
 		if (argv == NULL)
-			return(NULL);
+			fatal(net, "failure allocating argument space");
 		argv++;
 		cpp = &argv[(long)argv[-1] - 10];
 	}
-	*cpp++ = strdup(val);
+	if ((*cpp++ = strdup(val)) == NULL)
+		fatal(net, "failure allocating argument space");
 	*cpp = 0;
 	return(argv);
 }
diff --git a/lib/libc/net/linkaddr.c b/lib/libc/net/linkaddr.c
index 86bb7a2955ee..9b1da65450ec 100644
--- a/lib/libc/net/linkaddr.c
+++ b/lib/libc/net/linkaddr.c
@@ -35,6 +35,7 @@ __FBSDID("$FreeBSD$");
 
 #include <sys/types.h>
 #include <sys/socket.h>
+#include <net/if.h>
 #include <net/if_dl.h>
 #include <string.h>
 
@@ -125,31 +126,47 @@ link_ntoa(sdl)
 	const struct sockaddr_dl *sdl;
 {
 	static char obuf[64];
-	char *out = obuf;
-	int i;
-	u_char *in = (u_char *)LLADDR(sdl);
-	u_char *inlim = in + sdl->sdl_alen;
-	int firsttime = 1;
+	_Static_assert(sizeof(obuf) >= IFNAMSIZ + 20, "obuf is too small");
+	char *out;
+	const char *in, *inlim;
+	int namelen, i, rem;
 
-	if (sdl->sdl_nlen) {
-		bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen);
-		out += sdl->sdl_nlen;
-		if (sdl->sdl_alen)
+	namelen = (sdl->sdl_nlen <= IFNAMSIZ) ? sdl->sdl_nlen : IFNAMSIZ;
+
+	out = obuf;
+	rem = sizeof(obuf);
+	if (namelen > 0) {
+		bcopy(sdl->sdl_data, out, namelen);
+		out += namelen;
+		rem -= namelen;
+		if (sdl->sdl_alen > 0) {
 			*out++ = ':';
+			rem--;
+		}
 	}
-	while (in < inlim) {
-		if (firsttime)
-			firsttime = 0;
-		else
+
+	in = (const char *)sdl->sdl_data + sdl->sdl_nlen;
+	inlim = in + sdl->sdl_alen;
+
+	while (in < inlim && rem > 1) {
+		if (in != (const char *)sdl->sdl_data + sdl->sdl_nlen) {
 			*out++ = '.';
+			rem--;
+		}
 		i = *in++;
 		if (i > 0xf) {
-			out[1] = hexlist[i & 0xf];
+			if (rem < 3)
+				break;
+			*out++ = hexlist[i & 0xf];
 			i >>= 4;
-			out[0] = hexlist[i];
-			out += 2;
-		} else
 			*out++ = hexlist[i];
+			rem -= 2;
+		} else {
+			if (rem < 2)
+				break;
+			*out++ = hexlist[i];
+			rem++;
+		}
 	}
 	*out = 0;
 	return (obuf);
diff --git a/sys/conf/newvers.sh b/sys/conf/newvers.sh
index 5398221d4025..460177f397f1 100644
--- a/sys/conf/newvers.sh
+++ b/sys/conf/newvers.sh
@@ -32,7 +32,7 @@
 
 TYPE="FreeBSD"
 REVISION="9.3"
-BRANCH="RELEASE-p50"
+BRANCH="RELEASE-p51"
 if [ "X${BRANCH_OVERRIDE}" != "X" ]; then
 	BRANCH=${BRANCH_OVERRIDE}
 fi