linux-kernel - Re: [syzbot] Re: [syzbot] [kernel?] KMSAN: kernel-infoleak in vmci_host_unlocked

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Message-ID: <6858c3f4.050a0220.d71a0.0000.GAE@google.com>
Date: Sun, 22 Jun 2025 20:03:16 -0700
From: syzbot <syzbot+9b9124ae9b12d5af5d95@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] Re: [syzbot] [kernel?] KMSAN: kernel-infoleak in
 vmci_host_unlocked_ioctl (3)

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Subject: Re: [syzbot] [kernel?] KMSAN: kernel-infoleak in vmci_host_unlocked_ioctl (3)
Author: lizhi.xu@...driver.com

#syz test

diff --git a/drivers/misc/vmw_vmci/vmci_host.c b/drivers/misc/vmw_vmci/vmci_host.c
index b64944367ac5..4804aa668e47 100644
--- a/drivers/misc/vmw_vmci/vmci_host.c
+++ b/drivers/misc/vmw_vmci/vmci_host.c
@@ -433,6 +433,9 @@ static int vmci_host_do_receive_datagram(struct vmci_host_dev *vmci_host_dev,
 	recv_info.result = vmci_ctx_dequeue_datagram(vmci_host_dev->context,
 						     &size, &dg);
 
+	if (!vmci_host_code_active())
+		return VMCI_ERROR_UNAVAILABLE;
+
 	if (recv_info.result >= VMCI_SUCCESS) {
 		void __user *ubuf = (void __user *)(uintptr_t)recv_info.addr;
 		retval = copy_to_user(ubuf, dg, VMCI_DG_SIZE(dg));