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Diffstat (limited to 'drivers/vhost/vhost.c')
-rw-r--r--drivers/vhost/vhost.c23
1 files changed, 17 insertions, 6 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 7cd55e078794..e69d238c5af0 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -22,6 +22,7 @@
#include <linux/poll.h>
#include <linux/file.h>
#include <linux/highmem.h>
+#include <linux/slab.h>
#include <linux/net.h>
#include <linux/if_packet.h>
@@ -235,6 +236,10 @@ static int vq_memory_access_ok(void __user *log_base, struct vhost_memory *mem,
int log_all)
{
int i;
+
+ if (!mem)
+ return 0;
+
for (i = 0; i < mem->nregions; ++i) {
struct vhost_memory_region *m = mem->regions + i;
unsigned long a = m->userspace_addr;
@@ -476,8 +481,10 @@ 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 +496,10 @@ 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 +514,10 @@ 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;