From: Hans de Goede <hdegoede@redhat.com>
Date: Wed, 10 May 2023 16:18:56 +0200
Subject: [PATCH] wifi: brcmfmac: Check for probe() id argument being NULL
References: bsc#1012628
Patch-mainline: 6.3.4
Git-commit: 60fc756fc8e6954a5618eecac73b255d651602e4

commit 60fc756fc8e6954a5618eecac73b255d651602e4 upstream.

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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 .../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 ff710b0b..00679a99 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
@@ -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);
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
index d2dad541..3fb333d5 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
@@ -2378,6 +2378,9 @@ 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)
 {
@@ -2388,6 +2391,14 @@ 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 246843ae..2178675a 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);
-- 
2.35.3