netdev - [PATCH net-XXX] vhost-vdpa: fix use after free in vhost_vdpa

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Date: Fri, 27 Oct 2023 15:12:54 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Bo Liu <liubo03@...pur.com>
Cc: "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>,
	kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
	netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH net-XXX] vhost-vdpa: fix use after free in vhost_vdpa_probe()

The put_device() calls vhost_vdpa_release_dev() which calls
ida_simple_remove() and frees "v".  So this call to
ida_simple_remove() is a use after free and a double free.

Fixes: ebe6a354fa7e ("vhost-vdpa: Call ida_simple_remove() when failed")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/vhost/vdpa.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 9a2343c45df0..1aa67729e188 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -1511,7 +1511,6 @@ static int vhost_vdpa_probe(struct vdpa_device *vdpa)
 
 err:
 	put_device(&v->dev);
-	ida_simple_remove(&vhost_vdpa_ida, v->minor);
 	return r;
 }
 
-- 
2.42.0