From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0B37638837F; Mon, 23 Mar 2026 14:56:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774277791; cv=none; b=KaMrzRV/Hkgm3sMHaCKyYy1tRJnmMRsWgnPz76LGAqu35Kr18nime4fi99SQa38eYdyHS99nu3L1ZjZRt7VDo9iNqg00AFD4Mw2Q0MYS/5SQaiEVW8FxAFviHPKWDqFq54uCTiEFjTeSVi0ZJvVn5xk5Sz0lC+WXmLUbPcc8WoM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774277791; c=relaxed/simple; bh=G/9bWT+R8CedDAR8qbV2shhDy3q93s9nMUmRtdQIjno=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=tuQQOysBpkhPd6Bqi5Q5Qh7mctSRgpR8f2UlMg2mBBpOxA9h6N4yujhmvx1U0MlOzMu9hqiT4+/PHOlsFOjfZUeV2MtBTCnX7wPVYGmaXz0FFtILznMbVinIHhOF9H+mES1N41UHzTT5w0/p1kqURmRPnEL+IXHZZWcVXXeqgk0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Q27VxEwm; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Q27VxEwm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 820E7C4CEF7; Mon, 23 Mar 2026 14:56:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1774277790; bh=G/9bWT+R8CedDAR8qbV2shhDy3q93s9nMUmRtdQIjno=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Q27VxEwmkSre+32SpUCzgxfVNpd/FeEIyP77Gm9KG/uG/GHqjoOEXWGWRysXNoNe9 UxJ2XY+56ZLccxFOdfjfdsYRK5pY5KLq+GDs+LbcaHsrWKpdjoMgqRqPxXZYoCoPf5 91Wp9fA/A8QuXwOwkPP4gnt726MzFRRtqLNw9NOY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Daniil Dulov , Johannes Berg Subject: [PATCH 6.6 105/567] wifi: cfg80211: cancel rfkill_block work in wiphy_unregister() Date: Mon, 23 Mar 2026 14:40:25 +0100 Message-ID: <20260323134536.423228123@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260323134533.749096647@linuxfoundation.org> References: <20260323134533.749096647@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Daniil Dulov commit 767d23ade706d5fa51c36168e92a9c5533c351a1 upstream. There is a use-after-free error in cfg80211_shutdown_all_interfaces found by syzkaller: BUG: KASAN: use-after-free in cfg80211_shutdown_all_interfaces+0x213/0x220 Read of size 8 at addr ffff888112a78d98 by task kworker/0:5/5326 CPU: 0 UID: 0 PID: 5326 Comm: kworker/0:5 Not tainted 6.19.0-rc2 #2 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Workqueue: events cfg80211_rfkill_block_work Call Trace: dump_stack_lvl+0x116/0x1f0 print_report+0xcd/0x630 kasan_report+0xe0/0x110 cfg80211_shutdown_all_interfaces+0x213/0x220 cfg80211_rfkill_block_work+0x1e/0x30 process_one_work+0x9cf/0x1b70 worker_thread+0x6c8/0xf10 kthread+0x3c5/0x780 ret_from_fork+0x56d/0x700 ret_from_fork_asm+0x1a/0x30 The problem arises due to the rfkill_block work is not cancelled when wiphy is being unregistered. In order to fix the issue cancel the corresponding work in wiphy_unregister(). Found by Linux Verification Center (linuxtesting.org) with Syzkaller. Fixes: 1f87f7d3a3b4 ("cfg80211: add rfkill support") Cc: stable@vger.kernel.org Signed-off-by: Daniil Dulov Link: https://patch.msgid.link/20260211082024.1967588-1-d.dulov@aladdin.ru Signed-off-by: Johannes Berg Signed-off-by: Greg Kroah-Hartman --- net/wireless/core.c | 1 + 1 file changed, 1 insertion(+) --- a/net/wireless/core.c +++ b/net/wireless/core.c @@ -1132,6 +1132,7 @@ void wiphy_unregister(struct wiphy *wiph /* this has nothing to do now but make sure it's gone */ cancel_work_sync(&rdev->wiphy_work); + cancel_work_sync(&rdev->rfkill_block); cancel_work_sync(&rdev->conn_work); flush_work(&rdev->event_work); cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);