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Date:	Wed, 17 Mar 2010 16:42:50 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>,
	Jiri Slaby <jirislaby@...il.com>, kvm@...r.kernel.org,
	virtualization@...ts.osdl.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] vhost: fix error handling in vring ioctls

Stanse found a locking problem in vhost_set_vring:
several returns from VHOST_SET_VRING_KICK, VHOST_SET_VRING_CALL,
VHOST_SET_VRING_ERR with the vq->mutex held.
Fix these up.

Reported-by: Jiri Slaby <jirislaby@...il.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 drivers/vhost/vhost.c |   18 ++++++++++++------
 1 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 7cd55e0..7bd7a1e 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -476,8 +476,10 @@ static long vhost_set_vring(struct vhost_dev *d, int ioctl, void __user *argp)
 		if (r < 0)
 			break;
 		eventfp = f.fd == -1 ? NULL : eventfd_fget(f.fd);
-		if (IS_ERR(eventfp))
-			return PTR_ERR(eventfp);
+		if (IS_ERR(eventfp)) {
+			r = PTR_ERR(eventfp);
+			break;
+		}
 		if (eventfp != vq->kick) {
 			pollstop = filep = vq->kick;
 			pollstart = vq->kick = eventfp;
@@ -489,8 +491,10 @@ static long vhost_set_vring(struct vhost_dev *d, int ioctl, void __user *argp)
 		if (r < 0)
 			break;
 		eventfp = f.fd == -1 ? NULL : eventfd_fget(f.fd);
-		if (IS_ERR(eventfp))
-			return PTR_ERR(eventfp);
+		if (IS_ERR(eventfp)) {
+			r = PTR_ERR(eventfp);
+			break;
+		}
 		if (eventfp != vq->call) {
 			filep = vq->call;
 			ctx = vq->call_ctx;
@@ -505,8 +509,10 @@ static long vhost_set_vring(struct vhost_dev *d, int ioctl, void __user *argp)
 		if (r < 0)
 			break;
 		eventfp = f.fd == -1 ? NULL : eventfd_fget(f.fd);
-		if (IS_ERR(eventfp))
-			return PTR_ERR(eventfp);
+		if (IS_ERR(eventfp)) {
+			r = PTR_ERR(eventfp);
+			break;
+		}
 		if (eventfp != vq->error) {
 			filep = vq->error;
 			vq->error = eventfp;
-- 
1.7.0.18.g0d53a5
--
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