The probe() id argument may be NULL in 2 scenarios:

1. brcmf_pcie_pm_leave_D3() calling brcmf_pcie_probe() to reprobe the device.

2. If a user tries to manually bind the driver from sysfs then the sdio / pcie / usb probe() function gets called with NULL as id argument.

1. Is being hit by users causing the following oops on resume and causing wifi to stop working:

BUG: kernel NULL pointer dereference, address: 0000000000000018 <snip> Hardware name: Dell Inc. XPS 13 9350/0PWNCR, BIDS 1.13.0 02/10/2020 Workgueue: events_unbound async_run_entry_fn RIP: 0010:brcmf_pcie_probe+Ox16b/0x7a0 [brcmfmac] <snip> Call Trace: <TASK> brcmf_pcie_pm_leave_D3+0xc5/8x1a0 [brcmfmac be3b4cefca451e190fa35be8f00db1bbec293887] ? pci_pm_resume+0x5b/0xf0 ? pci_legacy_resume+0x80/0x80 dpm_run_callback+0x47/0x150 device_resume+0xa2/0x1f0 async_resume+0x1d/0x30 <snip>

Fix this by checking for id being NULL.

In the case of brcmf_pcie_probe() also add a manual lookup of the id when it is NULL so that fwvid will still get set correctly on reprobe on resume.

Fixes: da6d9c8ecd00 ("wifi: brcmfmac: add firmware vendor info in driver info") Reported-by: Felix nimrod4garoa@gmail.com Link: https://lore.kernel.org/regressions/4ef3f252ff530cbfa336f5a0d80710020fc5cb1e... Cc: Arend van Spriel arend.vanspriel@broadcom.com Cc: stable@vger.kernel.org Signed-off-by: Hans de Goede hdegoede@redhat.com --- drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c | 2 +- drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c | 8 +++++++- drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c | 2 +- 3 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c index 65d4799a5658..833524bc9b50 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c @@ -1067,7 +1067,7 @@ static int brcmf_ops_sdio_probe(struct sdio_func *func, sdiodev->bus_if = bus_if; bus_if->bus_priv.sdio = sdiodev; bus_if->proto_type = BRCMF_PROTO_BCDC; - bus_if->fwvid = id->driver_data; + bus_if->fwvid = id ? id->driver_data : BRCMF_FWVENDOR_INVALID; dev_set_drvdata(&func->dev, bus_if); dev_set_drvdata(&sdiodev->func1->dev, bus_if); sdiodev->dev = &sdiodev->func1->dev; diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c index a9b9b2dc62d4..b29ab19d695d 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c @@ -2339,6 +2339,9 @@ static void brcmf_pcie_debugfs_create(struct device *dev) } #endif

+/* Forward declaration for pci_match_id() call */ +static const struct pci_device_id brcmf_pcie_devid_table[]; + static int brcmf_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id) { @@ -2351,6 +2354,9 @@ brcmf_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id)

brcmf_dbg(PCIE, "Enter %x:%x\n", pdev->vendor, pdev->device);

+ if (!id) + id = pci_match_id(brcmf_pcie_devid_table, pdev); + ret = -ENOMEM; devinfo = kzalloc(sizeof(*devinfo), GFP_KERNEL); if (devinfo == NULL) @@ -2406,7 +2412,7 @@ brcmf_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id) bus->bus_priv.pcie = pcie_bus_dev; bus->ops = &brcmf_pcie_bus_ops; bus->proto_type = BRCMF_PROTO_MSGBUF; - bus->fwvid = id->driver_data; + bus->fwvid = id ? id->driver_data : BRCMF_FWVENDOR_INVALID; bus->chip = devinfo->coreid; bus->wowl_supported = pci_pme_capable(pdev, PCI_D3hot); dev_set_drvdata(&pdev->dev, bus); diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c index 246843aeb696..2541a47b1f8f 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c @@ -1425,7 +1425,7 @@ brcmf_usb_probe(struct usb_interface *intf, const struct usb_device_id *id) else brcmf_dbg(USB, "Broadcom full speed USB WLAN interface detected\n");

- ret = brcmf_usb_probe_cb(devinfo, id->driver_info); + ret = brcmf_usb_probe_cb(devinfo, id ? id->driver_info : BRCMF_FWVENDOR_INVALID); if (ret) goto fail;