[PATCH 5.4 386/411] scsi: myrb: Fix up null pointer access on myrb_cleanup()

Greg Kroah-Hartman
2022-06-13T11:51:44Z

From: Hannes Reinecke <hare@suse.de>

[ Upstream commit f9f0a46141e2e39bedb4779c88380d1b5f018c14 ]

When myrb_probe() fails the callback might not be set, so we need to
validate the 'disable_intr' callback in myrb_cleanup() to not cause a null
pointer exception. And while at it do not call myrb_cleanup() if we cannot
enable the PCI device at all.

Link: https://lore.kernel.org/r/20220523120244.99515-1-hare@suse.de
Reported-by: Zheyu Ma <zheyuma97@gmail.com>
Tested-by: Zheyu Ma <zheyuma97@gmail.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/myrb.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/myrb.c b/drivers/scsi/myrb.c
index 539ac8ce4fcd..35b32920a94a 100644
--- a/drivers/scsi/myrb.c
+++ b/drivers/scsi/myrb.c
@@ -1241,7 +1241,8 @@ static void myrb_cleanup(struct myrb_hba *cb)
myrb_unmap(cb);

if (cb->mmio_base) {
- cb->disable_intr(cb->io_base);
+ if (cb->disable_intr)
+ cb->disable_intr(cb->io_base);
iounmap(cb->mmio_base);
}
if (cb->irq)
@@ -3516,9 +3517,13 @@ static struct myrb_hba *myrb_detect(struct pci_dev *pdev,
mutex_init(&cb->dcmd_mutex);
mutex_init(&cb->dma_mutex);
cb->pdev = pdev;
+ cb->host = shost;

- if (pci_enable_device(pdev))
- goto failure;
+ if (pci_enable_device(pdev)) {
+ dev_err(&pdev->dev, "Failed to enable PCI device\n");
+ scsi_host_put(shost);
+ return NULL;
+ }

if (privdata->hw_init == DAC960_PD_hw_init ||
privdata->hw_init == DAC960_P_hw_init) {
--
2.35.1