wifi: brcmfmac: Check for probe() id argument being NULL

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 PCI and USB cases try a manual lookup of the id so that manually
binding the driver through sysfs and more importantly brcmf_pcie_probe()
on resume will work.

For the SDIO case there is no helper to do a manual sdio_device_id lookup,
so just directly error out on a NULL id there.

Fixes: da6d9c8ecd00 ("wifi: brcmfmac: add firmware vendor info in driver info")
Reported-by: Felix <nimrod4garoa@gmail.com>
Link: https://lore.kernel.org/regressions/4ef3f252ff530cbfa336f5a0d80710020fc5cb1e.camel@gmail.com/
Cc: stable@vger.kernel.org
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230510141856.46532-1-hdegoede@redhat.com

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
index 59f3e9c5e139..80220685f5e4 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
@@ -2394,6 +2394,9 @@ 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)
 {
@@ -2404,6 +2407,14 @@ brcmf_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	struct brcmf_core *core;
 	struct brcmf_bus *bus;
 
+	if (!id) {
+		id = pci_match_id(brcmf_pcie_devid_table, pdev);
+		if (!id) {
+			pci_err(pdev, "Error could not find pci_device_id for %x:%x\n", pdev->vendor, pdev->device);
+			return -ENODEV;
+		}
+	}
+
 	brcmf_dbg(PCIE, "Enter %x:%x\n", pdev->vendor, pdev->device);
 
 	ret = -ENOMEM;