scsi: libcxgbi: fix NULL pointer dereference in cxgbi_device_destroy()

If cxgb4i_ddp_init() fails then cdev->cdev2ppm will be NULL, so add a check
for NULL pointer before dereferencing it.

Link: https://lore.kernel.org/r/1576676731-3068-1-git-send-email-varun@chelsio.com
Signed-off-by: Varun Prakash <varun@chelsio.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/cxgbi/libcxgbi.c b/drivers/scsi/cxgbi/libcxgbi.c
index 0d044c1..dc9320f 100644 (file)
--- a/drivers/scsi/cxgbi/libcxgbi.c
+++ b/drivers/scsi/cxgbi/libcxgbi.c
@@ -121,7 +121,8 @@ static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
                "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
        cxgbi_hbas_remove(cdev);
        cxgbi_device_portmap_cleanup(cdev);
-       cxgbi_ppm_release(cdev->cdev2ppm(cdev));
+       if (cdev->cdev2ppm)
+               cxgbi_ppm_release(cdev->cdev2ppm(cdev));
        if (cdev->pmap.max_connect)
                cxgbi_free_big_mem(cdev->pmap.port_csk);
        kfree(cdev);