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scsi: myrb: Fix up null pointer access on myrb_cleanup() 

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>
This commit is contained in:
Hannes Reinecke 2022-05-23 14:02:44 +02:00 committed by Martin K. Petersen
parent 7ad36c8b2b
commit f9f0a46141
1 changed files with 8 additions and 3 deletions
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11
drivers/scsi/myrb.c
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@ -1239,7 +1239,8 @@ 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)
@ -3413,9 +3414,13 @@ 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) {