From 5166fdde7fa72e6448663099734ff3b67f25cb99 Mon Sep 17 00:00:00 2001
From: "Pedro F. Giffuni" <pfg@FreeBSD.org>
Date: Fri, 18 Mar 2016 19:04:01 +0000
Subject: [PATCH] aio_qphysio(): Avoid uninitialized pointer read on error.

For the !unmap case it may happen that pbuf gets called unreferenced
when vm_fault_quick_hold_pages() fails.
Initialize it so it doesn't cause trouble.

CID:		1352776
Reviewed by:	jhb
MFC after:	1 week
---
 sys/kern/vfs_aio.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/kern/vfs_aio.c b/sys/kern/vfs_aio.c
index 27fa23908ecf..95e4c53ea0ab 100644
--- a/sys/kern/vfs_aio.c
+++ b/sys/kern/vfs_aio.c
@@ -1226,7 +1226,8 @@ aio_qphysio(struct proc *p, struct kaiocb *job)
 	if (!unmap) {
 		job->pbuf = pbuf = (struct buf *)getpbuf(NULL);
 		BUF_KERNPROC(pbuf);
-	}
+	} else
+		pbuf = NULL;
 
 	AIO_LOCK(ki);
 	if (!unmap)