qemu-devel.nongnu.org archive mirror
 help / color / mirror / Atom feed
From: Kevin Wolf <kwolf@redhat.com>
To: qemu-block@nongnu.org
Cc: kwolf@redhat.com, raphael.norwitz@nutanix.com,
	qemu-devel@nongnu.org, stefanha@redhat.com, mst@redhat.com
Subject: [PATCH] vhost-user-blk: Fail gracefully on too large queue size
Date: Tue, 13 Apr 2021 18:52:40 +0200	[thread overview]
Message-ID: <20210413165240.43386-1-kwolf@redhat.com> (raw)

virtio_add_queue() aborts when queue_size > VIRTQUEUE_MAX_SIZE, so
vhost_user_blk_device_realize() should check this before calling it.

Simple reproducer:

qemu-system-x86_64 \
    -chardev null,id=foo \
    -device vhost-user-blk-pci,queue-size=4096,chardev=foo

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1935014
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
 hw/block/vhost-user-blk.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c
index 0b5b9d44cd..531e4ea063 100644
--- a/hw/block/vhost-user-blk.c
+++ b/hw/block/vhost-user-blk.c
@@ -467,6 +467,11 @@ static void vhost_user_blk_device_realize(DeviceState *dev, Error **errp)
         error_setg(errp, "vhost-user-blk: queue size must be non-zero");
+    if (s->queue_size) {
+        error_setg(errp, "vhost-user-blk: queue size must not exceed %d",
+                   VIRTQUEUE_MAX_SIZE);
+        return;
+    }
     if (!vhost_user_init(&s->vhost_user, &s->chardev, errp)) {

             reply	other threads:[~2021-04-13 16:53 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-13 16:52 Kevin Wolf [this message]
2021-04-13 16:59 ` Kevin Wolf

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210413165240.43386-1-kwolf@redhat.com \
    --to=kwolf@redhat.com \
    --cc=mst@redhat.com \
    --cc=qemu-block@nongnu.org \
    --cc=qemu-devel@nongnu.org \
    --cc=raphael.norwitz@nutanix.com \
    --cc=stefanha@redhat.com \
    --subject='Re: [PATCH] vhost-user-blk: Fail gracefully on too large queue size' \


* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).