crypto: ccp - Cleanup misc_dev on sev_exit()

Explicitly free and clear misc_dev in sev_exit(). Since devm_kzalloc()
associates misc_dev with the first device that gets probed, change from
devm_kzalloc() to kzalloc() and explicitly free memory in sev_exit() as
the first device probed is not guaranteed to be the last device released.
To ensure that the variable gets properly set to NULL, remove the local
definition of misc_dev.

Fixes: 200664d5237f ("crypto: ccp: Add Secure Encrypted Virtualization (SEV) command support")
Signed-off-by: John Allen <john.allen@amd.com>
Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index e467860f797dceb2da44ac6ba1f9e71d74845d36..aa591dae067c37ed1134aca09f705ea258a4d9a0 100644 (file)
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -896,9 +896,9 @@ EXPORT_SYMBOL_GPL(sev_guest_df_flush);
 
 static void sev_exit(struct kref *ref)
 {
-       struct sev_misc_dev *misc_dev = container_of(ref, struct sev_misc_dev, refcount);
-
        misc_deregister(&misc_dev->misc);
+       kfree(misc_dev);
+       misc_dev = NULL;
 }
 
 static int sev_misc_init(struct sev_device *sev)
@@ -916,7 +916,7 @@ static int sev_misc_init(struct sev_device *sev)
        if (!misc_dev) {
                struct miscdevice *misc;
 
-               misc_dev = devm_kzalloc(dev, sizeof(*misc_dev), GFP_KERNEL);
+               misc_dev = kzalloc(sizeof(*misc_dev), GFP_KERNEL);
                if (!misc_dev)
                        return -ENOMEM;