Patchwork We should check virtio_load return code

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Submitter Orit Wasserman
Date Feb. 28, 2012, 1:31 p.m.
Message ID <1330435867-17860-1-git-send-email-owasserm@redhat.com>
Download mbox | patch
Permalink /patch/143448/
State New
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Comments

Orit Wasserman - Feb. 28, 2012, 1:31 p.m.
Otherwise we crash on error.

Signed-off-by: Orit Wasserman <owasserm@redhat.com>
Signed-off-by: Ulrich Obergfell <uobergfe@redhat.com>
---
 hw/virtio-balloon.c    |    6 +++++-
 hw/virtio-blk.c        |    7 ++++++-
 hw/virtio-net.c        |    6 +++++-
 hw/virtio-scsi.c       |    7 ++++++-
 hw/virtio-serial-bus.c |    6 +++++-
 5 files changed, 27 insertions(+), 5 deletions(-)
Paolo Bonzini - Feb. 28, 2012, 1:40 p.m.
Il 28/02/2012 14:31, Orit Wasserman ha scritto:
> Otherwise we crash on error.
> 
> Signed-off-by: Orit Wasserman <owasserm@redhat.com>
> Signed-off-by: Ulrich Obergfell <uobergfe@redhat.com>
> ---
>  hw/virtio-balloon.c    |    6 +++++-
>  hw/virtio-blk.c        |    7 ++++++-
>  hw/virtio-net.c        |    6 +++++-
>  hw/virtio-scsi.c       |    7 ++++++-
>  hw/virtio-serial-bus.c |    6 +++++-
>  5 files changed, 27 insertions(+), 5 deletions(-)
> 
> diff --git a/hw/virtio-balloon.c b/hw/virtio-balloon.c
> index ce9d2c9..075ed87 100644
> --- a/hw/virtio-balloon.c
> +++ b/hw/virtio-balloon.c
> @@ -211,11 +211,15 @@ static void virtio_balloon_save(QEMUFile *f, void *opaque)
>  static int virtio_balloon_load(QEMUFile *f, void *opaque, int version_id)
>  {
>      VirtIOBalloon *s = opaque;
> +    int ret;
>  
>      if (version_id != 1)
>          return -EINVAL;
>  
> -    virtio_load(&s->vdev, f);
> +    ret = virtio_load(&s->vdev, f);
> +    if (ret) {
> +        return ret;
> +    }
>  
>      s->num_pages = qemu_get_be32(f);
>      s->actual = qemu_get_be32(f);
> diff --git a/hw/virtio-blk.c b/hw/virtio-blk.c
> index 49990f8..d4bb400 100644
> --- a/hw/virtio-blk.c
> +++ b/hw/virtio-blk.c
> @@ -537,11 +537,16 @@ static void virtio_blk_save(QEMUFile *f, void *opaque)
>  static int virtio_blk_load(QEMUFile *f, void *opaque, int version_id)
>  {
>      VirtIOBlock *s = opaque;
> +    int ret;
>  
>      if (version_id != 2)
>          return -EINVAL;
>  
> -    virtio_load(&s->vdev, f);
> +    ret = virtio_load(&s->vdev, f);
> +    if (ret) {
> +        return ret;
> +    }
> +
>      while (qemu_get_sbyte(f)) {
>          VirtIOBlockReq *req = virtio_blk_alloc_request(s);
>          qemu_get_buffer(f, (unsigned char*)&req->elem, sizeof(req->elem));
> diff --git a/hw/virtio-net.c b/hw/virtio-net.c
> index bc5e3a8..3f190d4 100644
> --- a/hw/virtio-net.c
> +++ b/hw/virtio-net.c
> @@ -891,11 +891,15 @@ static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
>  {
>      VirtIONet *n = opaque;
>      int i;
> +    int ret;
>  
>      if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
>          return -EINVAL;
>  
> -    virtio_load(&n->vdev, f);
> +    ret = virtio_load(&n->vdev, f);
> +    if (ret) {
> +        return ret;
> +    }
>  
>      qemu_get_buffer(f, n->mac, ETH_ALEN);
>      n->tx_waiting = qemu_get_be32(f);
> diff --git a/hw/virtio-scsi.c b/hw/virtio-scsi.c
> index e607edc..9797847 100644
> --- a/hw/virtio-scsi.c
> +++ b/hw/virtio-scsi.c
> @@ -558,7 +558,12 @@ static void virtio_scsi_save(QEMUFile *f, void *opaque)
>  static int virtio_scsi_load(QEMUFile *f, void *opaque, int version_id)
>  {
>      VirtIOSCSI *s = opaque;
> -    virtio_load(&s->vdev, f);
> +    int ret;
> +
> +    ret = virtio_load(&s->vdev, f);
> +    if (ret) {
> +        return ret;
> +    }
>      return 0;
>  }
>  
> diff --git a/hw/virtio-serial-bus.c b/hw/virtio-serial-bus.c
> index e22940e..4a33872 100644
> --- a/hw/virtio-serial-bus.c
> +++ b/hw/virtio-serial-bus.c
> @@ -590,13 +590,17 @@ static int virtio_serial_load(QEMUFile *f, void *opaque, int version_id)
>      VirtIOSerialPort *port;
>      uint32_t max_nr_ports, nr_active_ports, ports_map;
>      unsigned int i;
> +    int ret;
>  
>      if (version_id > 3) {
>          return -EINVAL;
>      }
>  
>      /* The virtio device */
> -    virtio_load(&s->vdev, f);
> +    ret = virtio_load(&s->vdev, f);
> +    if (ret) {
> +        return ret;
> +    }
>  
>      if (version_id < 2) {
>          return 0;

Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Amit Shah - March 1, 2012, 9:29 a.m.
On (Tue) 28 Feb 2012 [15:31:07], Orit Wasserman wrote:
> Otherwise we crash on error.

A description on how to reproduce the crash would be nice.

> Signed-off-by: Orit Wasserman <owasserm@redhat.com>
> Signed-off-by: Ulrich Obergfell <uobergfe@redhat.com>

Acked-by: Amit Shah <amit.shah@redhat.com>

		Amit
Markus Armbruster - March 1, 2012, 9:56 a.m.
Amit Shah <amit.shah@redhat.com> writes:

> On (Tue) 28 Feb 2012 [15:31:07], Orit Wasserman wrote:
>> Otherwise we crash on error.
>
> A description on how to reproduce the crash would be nice.

Seconded.  No bug fix is complete without instructions to reproduce.

[...]
Orit Wasserman - March 1, 2012, 11 a.m.
On 03/01/2012 11:29 AM, Amit Shah wrote:
> On (Tue) 28 Feb 2012 [15:31:07], Orit Wasserman wrote:
>> Otherwise we crash on error.
> 
> A description on how to reproduce the crash would be nice.

We changed the default of the command -device virtio-blk-pci,drive=...
from scsi=on to scsi=off for security reasons (disable SG_IO).
If you try to migrate from an older version (which had the default scsi=on) to a newer version
(that has default scsi=off) we get the crash.

Orit
> 
>> Signed-off-by: Orit Wasserman <owasserm@redhat.com>
>> Signed-off-by: Ulrich Obergfell <uobergfe@redhat.com>
> 
> Acked-by: Amit Shah <amit.shah@redhat.com>
> 
> 		Amit
Paolo Bonzini - March 1, 2012, 11:14 a.m.
Il 01/03/2012 12:00, Orit Wasserman ha scritto:
>> > A description on how to reproduce the crash would be nice.
> We changed the default of the command -device virtio-blk-pci,drive=...
> from scsi=on to scsi=off for security reasons (disable SG_IO).
> If you try to migrate from an older version (which had the default scsi=on) to a newer version
> (that has default scsi=off) we get the crash.

Actually the default didn't change in QEMU.  It's libvirt that changed
the command-line with which it invokes QEMU.

This patch fixes the crash, I'll post one to fix migration later.

Paolo

Patch

diff --git a/hw/virtio-balloon.c b/hw/virtio-balloon.c
index ce9d2c9..075ed87 100644
--- a/hw/virtio-balloon.c
+++ b/hw/virtio-balloon.c
@@ -211,11 +211,15 @@  static void virtio_balloon_save(QEMUFile *f, void *opaque)
 static int virtio_balloon_load(QEMUFile *f, void *opaque, int version_id)
 {
     VirtIOBalloon *s = opaque;
+    int ret;
 
     if (version_id != 1)
         return -EINVAL;
 
-    virtio_load(&s->vdev, f);
+    ret = virtio_load(&s->vdev, f);
+    if (ret) {
+        return ret;
+    }
 
     s->num_pages = qemu_get_be32(f);
     s->actual = qemu_get_be32(f);
diff --git a/hw/virtio-blk.c b/hw/virtio-blk.c
index 49990f8..d4bb400 100644
--- a/hw/virtio-blk.c
+++ b/hw/virtio-blk.c
@@ -537,11 +537,16 @@  static void virtio_blk_save(QEMUFile *f, void *opaque)
 static int virtio_blk_load(QEMUFile *f, void *opaque, int version_id)
 {
     VirtIOBlock *s = opaque;
+    int ret;
 
     if (version_id != 2)
         return -EINVAL;
 
-    virtio_load(&s->vdev, f);
+    ret = virtio_load(&s->vdev, f);
+    if (ret) {
+        return ret;
+    }
+
     while (qemu_get_sbyte(f)) {
         VirtIOBlockReq *req = virtio_blk_alloc_request(s);
         qemu_get_buffer(f, (unsigned char*)&req->elem, sizeof(req->elem));
diff --git a/hw/virtio-net.c b/hw/virtio-net.c
index bc5e3a8..3f190d4 100644
--- a/hw/virtio-net.c
+++ b/hw/virtio-net.c
@@ -891,11 +891,15 @@  static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
 {
     VirtIONet *n = opaque;
     int i;
+    int ret;
 
     if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
         return -EINVAL;
 
-    virtio_load(&n->vdev, f);
+    ret = virtio_load(&n->vdev, f);
+    if (ret) {
+        return ret;
+    }
 
     qemu_get_buffer(f, n->mac, ETH_ALEN);
     n->tx_waiting = qemu_get_be32(f);
diff --git a/hw/virtio-scsi.c b/hw/virtio-scsi.c
index e607edc..9797847 100644
--- a/hw/virtio-scsi.c
+++ b/hw/virtio-scsi.c
@@ -558,7 +558,12 @@  static void virtio_scsi_save(QEMUFile *f, void *opaque)
 static int virtio_scsi_load(QEMUFile *f, void *opaque, int version_id)
 {
     VirtIOSCSI *s = opaque;
-    virtio_load(&s->vdev, f);
+    int ret;
+
+    ret = virtio_load(&s->vdev, f);
+    if (ret) {
+        return ret;
+    }
     return 0;
 }
 
diff --git a/hw/virtio-serial-bus.c b/hw/virtio-serial-bus.c
index e22940e..4a33872 100644
--- a/hw/virtio-serial-bus.c
+++ b/hw/virtio-serial-bus.c
@@ -590,13 +590,17 @@  static int virtio_serial_load(QEMUFile *f, void *opaque, int version_id)
     VirtIOSerialPort *port;
     uint32_t max_nr_ports, nr_active_ports, ports_map;
     unsigned int i;
+    int ret;
 
     if (version_id > 3) {
         return -EINVAL;
     }
 
     /* The virtio device */
-    virtio_load(&s->vdev, f);
+    ret = virtio_load(&s->vdev, f);
+    if (ret) {
+        return ret;
+    }
 
     if (version_id < 2) {
         return 0;