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 7DB4C3859CC for ; Mon, 9 Mar 2026 11:38:27 +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=1773056307; cv=none; b=DMcHHehyLNTekpHyFqmhSnDN5RmhvEG9QekkpGK3ug4/b5B7rMUzcjhWAcpETOX+/o+FD/ZVxRCl+GK+0dDX4tBncpip3Pj91QwFvj1RTDQNsJZbT/aTxtS0BkXHC0VYkzZXdz1vta64bm8XQD+qaVrgmBo98ssKlCOER2Nv7WE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773056307; c=relaxed/simple; bh=Z3GskNKFPKJhrp+86/zwCNeNhHCaP/ejPrafKJn76Zo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IFRM0ueiZYg51eAn9NC0nihRltqlA76PPPyQJezeWAp7GZSUGOJYuvMDMBHyMxuuYYYThUbH2KtJHATgl8WmzFS5vP5xYKLrhn0rpwz7pnC9hxQ5OhY5T7pufpV4hhg/R0tsyBrIV53t49tU+SFcfnObXGHo+Ee99L9C6b8oDVI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=QJvFmrM0; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="QJvFmrM0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BA00BC2BC9E; Mon, 9 Mar 2026 11:38:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773056307; bh=Z3GskNKFPKJhrp+86/zwCNeNhHCaP/ejPrafKJn76Zo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QJvFmrM0quh1KOiZHC7+euB5Y7TrPNsdLftonkrOtsY5x4XBzB/wl/EMdk9XSKFz3 ID2TBezebrAc2/ip9EUZ8bPIOA9NUpgyYWFTkU3Dt4jfb0mO8hkglh2ZBfrVo6chX2 8P7hQ2KunjZxzITbwWGNKVRNZcDizJxZTNIPzlKTuf8rFJv4M0l36VnvySxbroYwtv b5Tt0YrDgZgNPCRHp31mNyEFa0sXBesrdEZzW1lggg19bB2yMzgmTeOXbLanInhz8f M0fsyCHGeoKPy+yJmTXRGrNJSLLZOHrK2C14QSCbhXjq2FEIV2fSoI3irtdoG4KJAs NFG1ItF9wvT4Q== From: Sasha Levin To: stable@vger.kernel.org Cc: Daniil Dulov , Johannes Berg , Sasha Levin Subject: [PATCH 6.1.y 2/2] wifi: cfg80211: cancel rfkill_block work in wiphy_unregister() Date: Mon, 9 Mar 2026 07:38:23 -0400 Message-ID: <20260309113823.823525-2-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260309113823.823525-1-sashal@kernel.org> References: <2026030934-undocked-comic-8b24@gregkh> <20260309113823.823525-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Daniil Dulov [ Upstream commit 767d23ade706d5fa51c36168e92a9c5533c351a1 ] 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: Sasha Levin --- net/wireless/core.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/wireless/core.c b/net/wireless/core.c index bc84953510e71..e75326932c329 100644 --- a/net/wireless/core.c +++ b/net/wireless/core.c @@ -1125,6 +1125,7 @@ void wiphy_unregister(struct wiphy *wiphy) /* 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); -- 2.51.0