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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: da6d9c8ecd ("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
This commit is contained in:
Hans de Goede 2023-05-10 16:18:56 +02:00 committed by Kalle Valo
parent 8e4942db5f
commit 60fc756fc8
3 changed files with 27 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
View File

@ -1039,6 +1039,11 @@ static int brcmf_ops_sdio_probe(struct sdio_func *func,
struct brcmf_sdio_dev *sdiodev;
struct brcmf_bus *bus_if;
if (!id) {
dev_err(&func->dev, "Error no sdio_device_id passed for %x:%x\n", func->vendor, func->device);
return -ENODEV;
}
brcmf_dbg(SDIO, "Enter\n");
brcmf_dbg(SDIO, "Class=%x\n", func->class);
brcmf_dbg(SDIO, "sdio vendor ID: 0x%04x\n", func->vendor);

11
drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
View File

@ -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;

11
drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c
View File

@ -1331,6 +1331,9 @@ brcmf_usb_disconnect_cb(struct brcmf_usbdev_info *devinfo)
brcmf_usb_detach(devinfo);
}
/* Forward declaration for usb_match_id() call */
static const struct usb_device_id brcmf_usb_devid_table[];
static int
brcmf_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
@ -1342,6 +1345,14 @@ brcmf_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
u32 num_of_eps;
u8 endpoint_num, ep;
if (!id) {
id = usb_match_id(intf, brcmf_usb_devid_table);
if (!id) {
dev_err(&intf->dev, "Error could not find matching usb_device_id\n");
return -ENODEV;
}
}
brcmf_dbg(USB, "Enter 0x%04x:0x%04x\n", id->idVendor, id->idProduct);
devinfo = kzalloc(sizeof(*devinfo), GFP_ATOMIC);