6.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kuen-Han Tsai <redacted>

commit e002e92e88e12457373ed096b18716d97e7bbb20 upstream.

Commit ec35c1969650 ("usb: gadget: f_ncm: Fix net_device lifecycle with
device_move") reparents the gadget device to /sys/devices/virtual during
unbind, clearing the gadget pointer. If the userspace tool queries on
the surviving interface during this detached window, this leads to a
NULL pointer dereference.

Unable to handle kernel NULL pointer dereference
Call trace:
 eth_get_drvinfo+0x50/0x90
 ethtool_get_drvinfo+0x5c/0x1f0
 __dev_ethtool+0xaec/0x1fe0
 dev_ethtool+0x134/0x2e0
 dev_ioctl+0x338/0x560

Add a NULL check for dev->gadget in eth_get_drvinfo(). When detached,
skip copying the fw_version and bus_info strings, which is natively
handled by ethtool_get_drvinfo for empty strings.

Suggested-by: Val Packett <redacted>
Reported-by: Val Packett <redacted>
Closes: https://lore.kernel.org/linux-usb/10890524-cf83-4a71-b879-93e2b2cc1fcc@packett.cool/ (local)
Fixes: ec35c1969650 ("usb: gadget: f_ncm: Fix net_device lifecycle with device_move")
Cc: stable <stable@kernel.org>
Signed-off-by: Kuen-Han Tsai <redacted>
Link: https://patch.msgid.link/20260316-eth-null-deref-v1-1-07005f33be85@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/usb/gadget/function/u_ether.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/usb/gadget/function/u_ether.c
+++ b/drivers/usb/gadget/function/u_ether.c

@@ -112,8 +112,10 @@ static void eth_get_drvinfo(struct net_d
 
 	strscpy(p->driver, "g_ether", sizeof(p->driver));
 	strscpy(p->version, UETH__VERSION, sizeof(p->version));
-	strscpy(p->fw_version, dev->gadget->name, sizeof(p->fw_version));
-	strscpy(p->bus_info, dev_name(&dev->gadget->dev), sizeof(p->bus_info));
+	if (dev->gadget) {
+		strscpy(p->fw_version, dev->gadget->name, sizeof(p->fw_version));
+		strscpy(p->bus_info, dev_name(&dev->gadget->dev), sizeof(p->bus_info));
+	}
 }
 
 /* REVISIT can also support: