Patch "tpm: tpm_vtpm_proxy: fix a race condition in /dev/vtpmx creation" has been added to the 5.4-stable tree

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This is a note to let you know that I've just added the patch titled

    tpm: tpm_vtpm_proxy: fix a race condition in /dev/vtpmx creation

to the 5.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     tpm-tpm_vtpm_proxy-fix-a-race-condition-in-dev-vtpmx-creation.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From f4032d615f90970d6c3ac1d9c0bce3351eb4445c Mon Sep 17 00:00:00 2001
From: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxx>
Date: Tue, 16 May 2023 01:25:54 +0300
Subject: tpm: tpm_vtpm_proxy: fix a race condition in /dev/vtpmx creation

From: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxx>

commit f4032d615f90970d6c3ac1d9c0bce3351eb4445c upstream.

/dev/vtpmx is made visible before 'workqueue' is initialized, which can
lead to a memory corruption in the worst case scenario.

Address this by initializing 'workqueue' as the very first step of the
driver initialization.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 6f99612e2500 ("tpm: Proxy driver for supporting multiple emulated TPMs")
Reviewed-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxx>
Signed-off-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/char/tpm/tpm_vtpm_proxy.c |   30 +++++++-----------------------
 1 file changed, 7 insertions(+), 23 deletions(-)

--- a/drivers/char/tpm/tpm_vtpm_proxy.c
+++ b/drivers/char/tpm/tpm_vtpm_proxy.c
@@ -693,37 +693,21 @@ static struct miscdevice vtpmx_miscdev =
 	.fops = &vtpmx_fops,
 };
 
-static int vtpmx_init(void)
-{
-	return misc_register(&vtpmx_miscdev);
-}
-
-static void vtpmx_cleanup(void)
-{
-	misc_deregister(&vtpmx_miscdev);
-}
-
 static int __init vtpm_module_init(void)
 {
 	int rc;
 
-	rc = vtpmx_init();
-	if (rc) {
-		pr_err("couldn't create vtpmx device\n");
-		return rc;
-	}
-
 	workqueue = create_workqueue("tpm-vtpm");
 	if (!workqueue) {
 		pr_err("couldn't create workqueue\n");
-		rc = -ENOMEM;
-		goto err_vtpmx_cleanup;
+		return -ENOMEM;
 	}
 
-	return 0;
-
-err_vtpmx_cleanup:
-	vtpmx_cleanup();
+	rc = misc_register(&vtpmx_miscdev);
+	if (rc) {
+		pr_err("couldn't create vtpmx device\n");
+		destroy_workqueue(workqueue);
+	}
 
 	return rc;
 }
@@ -731,7 +715,7 @@ err_vtpmx_cleanup:
 static void __exit vtpm_module_exit(void)
 {
 	destroy_workqueue(workqueue);
-	vtpmx_cleanup();
+	misc_deregister(&vtpmx_miscdev);
 }
 
 module_init(vtpm_module_init);


Patches currently in stable-queue which might be from jarkko.sakkinen@xxxxxxx are

queue-5.4/tpm-tpm_vtpm_proxy-fix-a-race-condition-in-dev-vtpmx-creation.patch



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