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crypto: ccp - Cleanup misc_dev on sev_exit()

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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: 200664d523 ("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>
This commit is contained in:
John Allen 2020-03-03 07:57:23 -06:00 committed by Herbert Xu
parent 7548bf8c17
commit 1f14b57ffc
1 changed files with 3 additions and 3 deletions
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6
drivers/crypto/ccp/sev-dev.c
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@ -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;