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 A8181359A8B; Thu, 12 Mar 2026 20:21:02 +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=1773346862; cv=none; b=Lq3J+hCE0XNKkI0fzl4K4dHFR2Q9ca6RaK4LWfnbNsze+V5jNDSFx2rGCmYSztVhdoXslyCp2XDHQtidQFSjo8WZHPCKSTkYcHogqemvPbhNVCUsFZztZRDuZyGQtD5KivSS0H43Kn83HcFsotIGJrkN09VtHPMJGddsj0u1uLM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773346862; c=relaxed/simple; bh=gFsC4RkJcngsn0f5FX+aMJLZ34pSsmkmmlTg5iwb74E=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=t1LSArgm3dBYOcnTKjIY4l0jKPyiL74gHVWvuJEv1a/BJvC1JCTmjty2DbM6wnkTYmSPDh9Vgf7ha9oG9Ggnl/XoMKqaPIBVU5PfOKmsxJYIUIqFhR5E1C/oLb6m0js65IywuLZLvHKsesCs+tnl8eaQLZakqJDbDEwyWfn2ukM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=facLKurP; 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="facLKurP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F0935C4CEF7; Thu, 12 Mar 2026 20:21:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1773346862; bh=gFsC4RkJcngsn0f5FX+aMJLZ34pSsmkmmlTg5iwb74E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=facLKurPhoj9fNOw9WIWDiFoerZK3SXfYl5JIyA9Q4x9oF+XA6a5Yk4SPerFtFrZM k6slsyMB8nVh+8sHVjWD18fllNenNNQBaEM7YWwP+CdUVBVNzw8gXX7zjIhPDAAsQj 3KiQO9l7DFZb12j6Sqte4QkTqD/8OnYerwudSQes= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Daniil Dulov , Johannes Berg Subject: [PATCH 6.12 145/265] wifi: cfg80211: cancel rfkill_block work in wiphy_unregister() Date: Thu, 12 Mar 2026 21:08:52 +0100 Message-ID: <20260312201023.497268992@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260312201018.128816016@linuxfoundation.org> References: <20260312201018.128816016@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 6.12-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 @@ -1174,6 +1174,7 @@ 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);