| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.14 46/57] crypto: ccp - Ignore unconfigured CCP device on suspend/resume | Date | Wed, 4 Sep 2019 19:54:14 +0200 |
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From: Gary R Hook <gary.hook@amd.com>
commit 5871cd93692c8071fb9358daccb715b5081316ac upstream.
If a CCP is unconfigured (e.g. there are no available queues) then there will be no data structures allocated for the device. Thus, we must check for validity of a pointer before trying to access structure members.
Fixes: 720419f01832f ("crypto: ccp - Introduce the AMD Secure Processor device") Cc: <stable@vger.kernel.org> Signed-off-by: Gary R Hook <gary.hook@amd.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/crypto/ccp/ccp-dev.c | 8 ++++++++ 1 file changed, 8 insertions(+)
--- a/drivers/crypto/ccp/ccp-dev.c +++ b/drivers/crypto/ccp/ccp-dev.c @@ -540,6 +540,10 @@ int ccp_dev_suspend(struct sp_device *sp unsigned long flags; unsigned int i; + /* If there's no device there's nothing to do */ + if (!ccp) + return 0; + spin_lock_irqsave(&ccp->cmd_lock, flags); ccp->suspending = 1; @@ -564,6 +568,10 @@ int ccp_dev_resume(struct sp_device *sp) unsigned long flags; unsigned int i; + /* If there's no device there's nothing to do */ + if (!ccp) + return 0; + spin_lock_irqsave(&ccp->cmd_lock, flags); ccp->suspending = 0;
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