pci_get_device may fail and return NULL. This eventually will be dereferenced in __pci_register_driver. So null check is necessary. Signed-off-by: Navid Emamdoost <navid.emamdoost@xxxxxxxxx> --- drivers/ata/pata_ali.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/ata/pata_ali.c b/drivers/ata/pata_ali.c index 0b122f903b8a..47d9bec1f2e2 100644 --- a/drivers/ata/pata_ali.c +++ b/drivers/ata/pata_ali.c @@ -627,6 +627,8 @@ static int __init ali_init(void) { int ret; ali_isa_bridge = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL); + if (!ali_isa_bridge) + return -EINVAL; ret = pci_register_driver(&ali_pci_driver); if (ret < 0) -- 2.17.1