Hi,
On 5/10/23 16:18, Hans de Goede wrote:
The probe() id argument may be NULL in 2 scenarios:
brcmf_pcie_pm_leave_D3() calling brcmf_pcie_probe() to reprobe the device.
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.
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... Cc: Arend van Spriel arend.vanspriel@broadcom.com Cc: stable@vger.kernel.org Signed-off-by: Hans de Goede hdegoede@redhat.com
This is now also:
Tested by: Nimrod MacIomhair nimrod4garoa@gmail.com
Can we get this regression fix merged please ?
Regards,
Hans
Changes in v2:
- Using BRCMF_FWVENDOR_INVALID will just lead to a probe() error later on, if NULL error out immediately instead of using BRCMF_FWVENDOR_INVALID.
.../net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c | 5 +++++ .../net/wireless/broadcom/brcm80211/brcmfmac/pcie.c | 11 +++++++++++ .../net/wireless/broadcom/brcm80211/brcmfmac/usb.c | 11 +++++++++++ 3 files changed, 27 insertions(+)
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c index 65d4799a5658..f06684f84789 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c @@ -1032,6 +1032,11 @@ 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);
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c index a9b9b2dc62d4..d9ecaa0cfdc4 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) { @@ -2349,6 +2352,14 @@ 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; diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c index 246843aeb696..2178675ae1a4 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c @@ -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);