linux-kernel - [PATCH v2 0/1] usbnet:fix NPE during rx

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Message-ID: <cover.1743510609.git.luying1@xiaomi.com>
Date: Tue,  1 Apr 2025 20:36:31 +0800
From: Ying Lu <luying526@...il.com>
To: oneukum@...e.com,
	andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com
Cc: netdev@...r.kernel.org,
	linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Ying Lu <luying1@...omi.com>
Subject: [PATCH v2 0/1] usbnet:fix NPE during rx_complete

From: Ying Lu <luying1@...omi.com>

The patchset fix the issue caused by the following modifications:
commit 04e906839a053f092ef53f4fb2d610983412b904
(usbnet: fix cyclical race on disconnect with work queue)

The issue:
The usb_submit_urb function lacks a usbnet_going_away validation,
whereas __usbnet_queue_skb includes this check. This inconsistency
creates a race condition where: A URB request may succeed, but
the corresponding SKB data fails to be queued.

Subsequent processes (e.g., rx_complete → defer_bh → __skb_unlink(skb, list))
attempt to access skb->next, triggering a NULL pointer dereference (Kernel Panic).

Fix issue:
adding the usbnet_going_away check in usb_submit_urb to synchronize the validation logic.

Changes in v2
Use the formal name instead of an email alias.

Ying Lu (1):
  usbnet:fix NPE during rx_complete

 drivers/net/usb/usbnet.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

-- 
2.49.0