From 7609abaaf3658280be83470a07a9f0f8289aee17 Mon Sep 17 00:00:00 2001
From: Giacomo Tesio <giacomo@tesio.it>
Date: Wed, 8 Feb 2017 00:07:01 +0100
Subject: [PATCH] libauth: fix potential null deref in auth_proxy

Should fix CID 155820
---
 sys/src/lib/auth/auth_proxy.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sys/src/lib/auth/auth_proxy.c b/sys/src/lib/auth/auth_proxy.c
index 3785293..3c75d81 100644
--- a/sys/src/lib/auth/auth_proxy.c
+++ b/sys/src/lib/auth/auth_proxy.c
@@ -199,6 +199,11 @@ auth_proxy(int fd, AuthGetkey *getkey, char *fmt, ...)
 	p = vsmprint(fmt, arg);
 	va_end(arg);
 
+	if(p == nil){
+		werrstr("not enough memory: %r");
+		return nil;
+	}
+
 	ai = nil;
 	afd = open("/mnt/factotum/rpc", ORDWR);
 	if(afd < 0){