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 C44B32F39A7; Sun, 1 Mar 2026 01:47:41 +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=1772329661; cv=none; b=A8p94J0tvHVvFX/J0EVI3Xi6AEhd02lk3GxPcvGqx4PDl9Y+czB0e1CebJR9hkCrvvlgVjPjW/i8kaKpJ0JaEaaioR2uEUsIkbk/XifsQl9iuUyxiBsWFWsL6aKWmsVeP73GjawfAUxT4nJI4UYpHadDm97BcYyl4OUpg6nIB7o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772329661; c=relaxed/simple; bh=ARllGZ6tB1zTW9sg85pAasRHhvOtyZxhNhLSBGTqQzk=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Z33rgu4BwrdyO+UWXTa31GFQZBwOu30I38bwCJ9zSu8oSnn5WSp0h8bL/tWew+w3llAzWrNt7myc+4+NKUcC0h97KLhOCy3usgwvfKs1nVABFeu0rMrHuSA9j3+sXNfsTInZ+eVeq3KCa2P4qqgtTLKH6xxYKOOaPWWoJnquva4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Im7mEb2U; 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="Im7mEb2U" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CB2E7C19421; Sun, 1 Mar 2026 01:47:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772329661; bh=ARllGZ6tB1zTW9sg85pAasRHhvOtyZxhNhLSBGTqQzk=; h=From:To:Cc:Subject:Date:From; b=Im7mEb2UKE3W+lvMw7KHPNjPwptFIMTElhlyptUSFT6DXdh0qTFvE99bs47iz/bx+ 2r8zr9QLnL+BwSNy1FmhnY3wIj4nRMNNA4rXjvs03MJ95MrN+WDFYzuxnzHayTDf8F soGpjmCrc4E0w3x48GrPmvRzFNBmOVTt9tiYl+SvAGFvy1VjyUAam9jGW6CaOCmmUL xQYWcitXpMfFdzFDzvV4xFBZDUF4Mufqi6jxwULMSKtcAdudOjzHcX27qFc3bMT3fH ldQG+U1hwi9cBjEmPCJYeY+AyPt59RJtuNjTlHhzJcJIsE0Y/eytRI8oyAmnkz+4sG 6GGrGjdqXWOwQ== From: Sasha Levin To: stable@vger.kernel.org, duoming@zju.edu.cn Cc: stable@kernel.org, Jijie Shao , Simon Horman , Jakub Kicinski , linux-atm-general@lists.sourceforge.net, netdev@vger.kernel.org Subject: FAILED: Patch "atm: fore200e: fix use-after-free in tasklets during device removal" failed to apply to 6.1-stable tree Date: Sat, 28 Feb 2026 20:47:37 -0500 Message-ID: <20260301014739.1711600-1-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Hint: ignore X-stable: review Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From 8930878101cd40063888a68af73b1b0f8b6c79bc Mon Sep 17 00:00:00 2001 From: Duoming Zhou Date: Tue, 10 Feb 2026 17:45:37 +0800 Subject: [PATCH] atm: fore200e: fix use-after-free in tasklets during device removal When the PCA-200E or SBA-200E adapter is being detached, the fore200e is deallocated. However, the tx_tasklet or rx_tasklet may still be running or pending, leading to use-after-free bug when the already freed fore200e is accessed again in fore200e_tx_tasklet() or fore200e_rx_tasklet(). One of the race conditions can occur as follows: CPU 0 (cleanup) | CPU 1 (tasklet) fore200e_pca_remove_one() | fore200e_interrupt() fore200e_shutdown() | tasklet_schedule() kfree(fore200e) | fore200e_tx_tasklet() | fore200e-> // UAF Fix this by ensuring tx_tasklet or rx_tasklet is properly canceled before the fore200e is released. Add tasklet_kill() in fore200e_shutdown() to synchronize with any pending or running tasklets. Moreover, since fore200e_reset() could prevent further interrupts or data transfers, the tasklet_kill() should be placed after fore200e_reset() to prevent the tasklet from being rescheduled in fore200e_interrupt(). Finally, it only needs to do tasklet_kill() when the fore200e state is greater than or equal to FORE200E_STATE_IRQ, since tasklets are uninitialized in earlier states. In a word, the tasklet_kill() should be placed in the FORE200E_STATE_IRQ branch within the switch...case structure. This bug was identified through static analysis. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@kernel.org Suggested-by: Jijie Shao Signed-off-by: Duoming Zhou Reviewed-by: Jijie Shao Reviewed-by: Simon Horman Link: https://patch.msgid.link/20260210094537.9767-1-duoming@zju.edu.cn Signed-off-by: Jakub Kicinski --- drivers/atm/fore200e.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/atm/fore200e.c b/drivers/atm/fore200e.c index f62e385714403..fec081db36dc4 100644 --- a/drivers/atm/fore200e.c +++ b/drivers/atm/fore200e.c @@ -373,6 +373,10 @@ fore200e_shutdown(struct fore200e* fore200e) fallthrough; case FORE200E_STATE_IRQ: free_irq(fore200e->irq, fore200e->atm_dev); +#ifdef FORE200E_USE_TASKLET + tasklet_kill(&fore200e->tx_tasklet); + tasklet_kill(&fore200e->rx_tasklet); +#endif fallthrough; case FORE200E_STATE_ALLOC_BUF: -- 2.51.0