linux-kernel - [PATCH] vdpa/vp_vdpa: fix kfree a wrong pointer in vp_vdpa

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Message-ID: <20221207120813.2837529-1-sunnanyong@huawei.com>
Date:   Wed, 7 Dec 2022 20:08:13 +0800
From:   Nanyong Sun <sunnanyong@...wei.com>
To:     <mst@...hat.com>, <jasowang@...hat.com>, <gautam.dawar@...inx.com>,
        <elic@...dia.com>, <sgarzare@...hat.com>
CC:     <wangrong68@...wei.com>, <lulu@...hat.com>,
        <virtualization@...ts.linux-foundation.org>,
        <linux-kernel@...r.kernel.org>, <sunnanyong@...wei.com>,
        <liushixin2@...wei.com>, <wangkefeng.wang@...wei.com>
Subject: [PATCH] vdpa/vp_vdpa: fix kfree a wrong pointer in vp_vdpa_remove

From: Rong Wang <wangrong68@...wei.com>

In vp_vdpa_remove(), the code kfree(&vp_vdpa_mgtdev->mgtdev.id_table) uses
a reference of pointer as the argument of kfree, which is the wrong pointer
and then may hit crash like this:

Unable to handle kernel paging request at virtual address 00ffff003363e30c
Internal error: Oops: 96000004 [#1] SMP
Call trace:
 rb_next+0x20/0x5c
 ext4_readdir+0x494/0x5c4 [ext4]
 iterate_dir+0x168/0x1b4
 __se_sys_getdents64+0x68/0x170
 __arm64_sys_getdents64+0x24/0x30
 el0_svc_common.constprop.0+0x7c/0x1bc
 do_el0_svc+0x2c/0x94
 el0_svc+0x20/0x30
 el0_sync_handler+0xb0/0xb4
 el0_sync+0x160/0x180
Code: 54000220 f9400441 b4000161 aa0103e0 (f9400821)
SMP: stopping secondary CPUs
Starting crashdump kernel...

Fixes: ffbda8e9df10 ("vdpa/vp_vdpa : add vdpa tool support in vp_vdpa")
Signed-off-by: Rong Wang <wangrong68@...wei.com>
Signed-off-by: Nanyong Sun <sunnanyong@...wei.com>
---
 drivers/vdpa/virtio_pci/vp_vdpa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vdpa/virtio_pci/vp_vdpa.c b/drivers/vdpa/virtio_pci/vp_vdpa.c
index d448db0c4de3..8fe267ca3e76 100644
--- a/drivers/vdpa/virtio_pci/vp_vdpa.c
+++ b/drivers/vdpa/virtio_pci/vp_vdpa.c
@@ -647,7 +647,7 @@ static void vp_vdpa_remove(struct pci_dev *pdev)
 	mdev = vp_vdpa_mgtdev->mdev;
 	vp_modern_remove(mdev);
 	vdpa_mgmtdev_unregister(&vp_vdpa_mgtdev->mgtdev);
-	kfree(&vp_vdpa_mgtdev->mgtdev.id_table);
+	kfree(vp_vdpa_mgtdev->mgtdev.id_table);
 	kfree(mdev);
 	kfree(vp_vdpa_mgtdev);
 }
-- 
2.25.1