From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-lf1-f41.google.com (mail-lf1-f41.google.com [209.85.167.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B51842F3C10 for ; Wed, 8 Apr 2026 14:06:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.41 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775657196; cv=none; b=qdkr+Jy4VNDUbP47lfrKUDw0DN1mbcWkRpLn12lERxuIa3qmiN6clP96T46I7h2TPvph+ulv11FokRZq4NPPcD6Y8u9TdyN/4DIRFwnZPoVgrHVF3MHUJ/ovIESVo7As72WZWRGGAA6XPpOmjkzSnNgAyVKIyclCedm/TY1fJ8c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775657196; c=relaxed/simple; bh=PE/7KOQTUUI4eFe1WC1G6sJrqh0+D5Qk7KgGxUkU91A=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=m4cASjdlielhWM2uaUmhRPxo4iOvbfVmrPIJMFfp22c085ayoaHR7aUiRdR2NW1YIgcaIWXbkOhPvCUU9QboQNB8ZDQzDdXxH8qR1YqDJHOupMShX51azeVGoRtRUPHx1T5Eqvc/d1+NixFVlZzLLXvGOC4az074R3KANnxo0Mw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.com; spf=pass smtp.mailfrom=gmail.com; arc=none smtp.client-ip=209.85.167.41 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Received: by mail-lf1-f41.google.com with SMTP id 2adb3069b0e04-5a2c500750dso7624446e87.1 for ; Wed, 08 Apr 2026 07:06:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775657193; x=1776261993; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-gg:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=+aQ7qZB62vw22URUg0yl7/bcBDdLQ6KVExRcwvTyWNM=; b=mpoa9q490NknHYckpk7x82BudBybdZDzj0Rkxo38bJ5IasZgK+HSijNR+XPxhrVKwu qxa6OF0MQqDI3tPQoTpeAWvgtm5DwYgoBBWWNA86avrSixJe0fjxoYMho7jPaROyEhI/ ucMGIRfj3FSbWVVt/UQaoYxM2rlZCoZpfalWFZlLB56mOXQaxXXzcOVcCDbzyljm/aP9 CVQM/SP0QUCS4NJNI8Svo5FEY7doH5T3IS3UgqHl8lArf2mEL2SRoIiOJ5/pN+k195zT oNq4eVCTaajU6w+X6uf5+1mM1XT0pp9ZqfM6kIjhR/a3myHb2QWECCoce/B2Tr+il3Be 401g== X-Gm-Message-State: AOJu0Yz+vH4AqtFFH6UP4SezTEhwjd2Wpa4cAQ5efE1bOKjQnvyuUPku iPMMaAiCvXY+RARgaT5U0mkKTEAHW+oDlVmAszdevUMghc+wHxRLB1av6OonVC3r X-Gm-Gg: AeBDietE4Jiyd/PkxiCv7vwHfVzV1Y1nWG32p6FQrth1IAqtjotS4S7llioUU1L0VAK HtBoTISP8Dc8TQMbvwz2UWTtow+Iga0Zq8u0hokpR2QQZLewWa2wJzPVmmYVjB0SkWi1W1Fr3yi gbwpySiOdu04rUPRh7nKGayC4/b6BEIDrwIs/Abl6jRIBMWzYgfDRLFCEEpTciV4je5l3kwRAd6 kxABFKgSqXGvEQAkYZZ+nyFQyYATwXumP/iAHtM6KcUGDcLTIYW+CF/MKGy6Lb9heEkazGkj1U3 Hs3yaPwBPOb0CFnQoxCvmrxaeSa1wHGLhUpi+3nB7OQmrkcTogGbrbuBLdid8oy1gXRJ2WZJTqe 4Yve9Tz63AYFgqs8RUs3ViaLj736ZRE0N3SWNnz+btk9ZD7VT7wiNjBQAoWUoGUa1w4u5KuDbfb PpkMB1QyOrZr5KrOlYFQIr X-Received: by 2002:a05:6512:b83:b0:59e:65ff:e57e with SMTP id 2adb3069b0e04-5a33755d848mr5949305e87.12.1775657192082; Wed, 08 Apr 2026 07:06:32 -0700 (PDT) Received: from hackbase ([213.87.138.208]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5a2c6ca3100sm4836036e87.35.2026.04.08.07.06.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Apr 2026 07:06:31 -0700 (PDT) From: Alexander Popov To: stable@vger.kernel.org, Greg KH , Johannes Berg , Johannes Berg , Breno Leitao , Alexander Popov Subject: [PATCH 6.19.y] wifi: virt_wifi: remove SET_NETDEV_DEV to avoid use-after-free Date: Wed, 8 Apr 2026 17:06:05 +0300 Message-ID: <20260408140620.54527-1-alex.popov@linux.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026040715-good-overture-8018@gregkh> References: <2026040715-good-overture-8018@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Currently we execute `SET_NETDEV_DEV(dev, &priv->lowerdev->dev)` for the virt_wifi net devices. However, unregistering a virt_wifi device in netdev_run_todo() can happen together with the device referenced by SET_NETDEV_DEV(). It can result in use-after-free during the ethtool operations performed on a virt_wifi device that is currently being unregistered. Such a net device can have the `dev.parent` field pointing to the freed memory, but ethnl_ops_begin() calls `pm_runtime_get_sync(dev->dev.parent)`. Let's remove SET_NETDEV_DEV for virt_wifi to avoid bugs like this: ================================================================== BUG: KASAN: slab-use-after-free in __pm_runtime_resume+0xe2/0xf0 Read of size 2 at addr ffff88810cfc46f8 by task pm/606 Call Trace: dump_stack_lvl+0x4d/0x70 print_report+0x170/0x4f3 ? __pfx__raw_spin_lock_irqsave+0x10/0x10 kasan_report+0xda/0x110 ? __pm_runtime_resume+0xe2/0xf0 ? __pm_runtime_resume+0xe2/0xf0 __pm_runtime_resume+0xe2/0xf0 ethnl_ops_begin+0x49/0x270 ethnl_set_features+0x23c/0xab0 ? __pfx_ethnl_set_features+0x10/0x10 ? kvm_sched_clock_read+0x11/0x20 ? local_clock_noinstr+0xf/0xf0 ? local_clock+0x10/0x30 ? kasan_save_track+0x25/0x60 ? __kasan_kmalloc+0x7f/0x90 ? genl_family_rcv_msg_attrs_parse.isra.0+0x150/0x2c0 genl_family_rcv_msg_doit+0x1e7/0x2c0 ? __pfx_genl_family_rcv_msg_doit+0x10/0x10 ? __pfx_cred_has_capability.isra.0+0x10/0x10 ? stack_trace_save+0x8e/0xc0 genl_rcv_msg+0x411/0x660 ? __pfx_genl_rcv_msg+0x10/0x10 ? __pfx_ethnl_set_features+0x10/0x10 netlink_rcv_skb+0x121/0x380 ? __pfx_genl_rcv_msg+0x10/0x10 ? __pfx_netlink_rcv_skb+0x10/0x10 ? __pfx_down_read+0x10/0x10 genl_rcv+0x23/0x30 netlink_unicast+0x60f/0x830 ? __pfx_netlink_unicast+0x10/0x10 ? __pfx___alloc_skb+0x10/0x10 netlink_sendmsg+0x6ea/0xbc0 ? __pfx_netlink_sendmsg+0x10/0x10 ? __futex_queue+0x10b/0x1f0 ____sys_sendmsg+0x7a2/0x950 ? copy_msghdr_from_user+0x26b/0x430 ? __pfx_____sys_sendmsg+0x10/0x10 ? __pfx_copy_msghdr_from_user+0x10/0x10 ___sys_sendmsg+0xf8/0x180 ? __pfx____sys_sendmsg+0x10/0x10 ? __pfx_futex_wait+0x10/0x10 ? fdget+0x2e4/0x4a0 __sys_sendmsg+0x11f/0x1c0 ? __pfx___sys_sendmsg+0x10/0x10 do_syscall_64+0xe2/0x570 ? exc_page_fault+0x66/0xb0 entry_SYSCALL_64_after_hwframe+0x77/0x7f This fix may be combined with another one in the ethtool subsystem: https://lore.kernel.org/all/20260322075917.254874-1-alex.popov@linux.com/T/#u Fixes: d43c65b05b848e0b ("ethtool: runtime-resume netdev parent in ethnl_ops_begin") Cc: stable@vger.kernel.org Signed-off-by: Alexander Popov Acked-by: Greg Kroah-Hartman Reviewed-by: Breno Leitao Link: https://patch.msgid.link/20260324224607.374327-1-alex.popov@linux.com Signed-off-by: Johannes Berg (cherry picked from commit 789b06f9f39cdc7e895bdab2c034e39c41c8f8d6) --- drivers/net/wireless/virtual/virt_wifi.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/net/wireless/virtual/virt_wifi.c b/drivers/net/wireless/virtual/virt_wifi.c index 4eae89376feb..cd6b66242bff 100644 --- a/drivers/net/wireless/virtual/virt_wifi.c +++ b/drivers/net/wireless/virtual/virt_wifi.c @@ -557,7 +557,6 @@ static int virt_wifi_newlink(struct net_device *dev, eth_hw_addr_inherit(dev, priv->lowerdev); netif_stacked_transfer_operstate(priv->lowerdev, dev); - SET_NETDEV_DEV(dev, &priv->lowerdev->dev); dev->ieee80211_ptr = kzalloc(sizeof(*dev->ieee80211_ptr), GFP_KERNEL); if (!dev->ieee80211_ptr) { -- 2.53.0