tpm: Fix NULL return in tpm_ibmvtpm_get_desired_dma

commit 84eb186bc37c0900b53077ca21cf6dd15823a232 upstream.

There was an oops in tpm_ibmvtpm_get_desired_dma, which caused
kernel panic during boot when vTPM is enabled in Power partition
configured in AMS mode.

vio_bus_probe calls vio_cmo_bus_probe which calls
tpm_ibmvtpm_get_desired_dma to get the size needed for DMA allocation.
The problem is, vio_cmo_bus_probe is called before calling probe, which
for vtpm is tpm_ibmvtpm_probe and it's this function that initializes
and sets up vtpm's CRQ and gets required data values.  Therefore,
since this has not yet been done, NULL is returned in attempt to get
the size for DMA allocation.

We added a NULL check.  In addition, a default buffer size will
be set when NULL is returned.

Signed-off-by: Hon Ching (Vicky) Lo <honclo@linux.vnet.ibm.com>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/char/tpm/tpm_ibmvtpm.c b/drivers/char/tpm/tpm_ibmvtpm.c
index 56b07c35a13e173bf1cc5d10321d30d5a11f259e..010d814dd9f56b29e7c3bf0f3e2e89f40fe10ccd 100644 (file)
--- a/drivers/char/tpm/tpm_ibmvtpm.c
+++ b/drivers/char/tpm/tpm_ibmvtpm.c
@@ -307,6 +307,14 @@ static int tpm_ibmvtpm_remove(struct vio_dev *vdev)
 static unsigned long tpm_ibmvtpm_get_desired_dma(struct vio_dev *vdev)
 {
        struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev);
+
+       /* ibmvtpm initializes at probe time, so the data we are
+       * asking for may not be set yet. Estimate that 4K required
+       * for TCE-mapped buffer in addition to CRQ.
+       */
+       if (!ibmvtpm)
+               return CRQ_RES_BUF_SIZE + PAGE_SIZE;
+
        return CRQ_RES_BUF_SIZE + ibmvtpm->rtce_size;
 }