From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from ale.deltatee.com (ale.deltatee.com [204.191.154.188]) (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 4D9AD339370; Mon, 31 Aug 2026 19:14:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=204.191.154.188 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788203668; cv=none; b=KHf2Dl90Dgp0VvNjUlj02m1GqKuUbvIPPZWIbk70UT4cl4le1wsfTKSf7vKinJ+B5vuygmHT+iClurZ2PHxu/pLRftV+47p8ZfIAuj5cmYV6NcoWP1qw5iuOlIqPWhHFAz4fs+EARwK1w7mTPcKbmTAOznK7jD8nsgKxbFcmyjU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788203668; c=relaxed/simple; bh=OdYMauSOMVqtmhbAMGKb7SLpt/PeEUye59CzQy4IYj4=; h=From:To:Cc:Date:Message-ID:In-Reply-To:References:MIME-Version: Subject; b=UibaFA7bfw44mF/UbS0S4/T05uGooz48AQZlkIvGd55RkZeRS76nYKVrcb7tQ+oL6YKbcPT3/kuSIFWj5EgNGSEB4bCMja/c5ydDaX9zgCTgDjmEwsYcHZhhSYEHoOEeZs99vigvf8ihrwGMPL3nbsIhZxglaC2eyhZWgdKE+s0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=deltatee.com; spf=pass smtp.mailfrom=deltatee.com; dkim=pass (2048-bit key) header.d=deltatee.com header.i=@deltatee.com header.b=QKw9iHhe; arc=none smtp.client-ip=204.191.154.188 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=deltatee.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=deltatee.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=deltatee.com header.i=@deltatee.com header.b="QKw9iHhe" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=deltatee.com; s=20200525; h=Subject:MIME-Version:References:In-Reply-To: Message-ID:Date:Cc:To:From:content-disposition; bh=w8iS4kDDCughqNC87L2j6uPD9gcxQyLhqwq0a9EutZ0=; b=QKw9iHheWwglj8DhXAxENZ6v0U CmdZkYahIIK+i8QdFh30j5/vDVB8VmdcxS2fH5g4YcfD23BthIRjjA2sySMAl0A8+Z+gA4WCZm3qo UMxR5fuR0yabasTlBJPgabCMNAw8o/WaTTJ+/sthSKM4S9szYkXY4SLXV65KOeRjSL5ADcSQ1D5Kz w7AK9dMEeVvzJJ+cxR7FSidTvuxAhHO+1ArRtROg4AXSxOios21WLK/gd2tDbDdVpfga+rAroPOqc CHBZ7boQLYYi3vOjfd/mPsp0PdBqtdBriJbkrXqpWqLqEWqMaFaKTu9votV5CSbF0oPkT1J+5wyVY KZfbvC1g==; Received: from cgy1-donard.priv.deltatee.com ([172.16.1.31]) by ale.deltatee.com with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1x17Sc-000000007Dq-01by; Mon, 31 Aug 2026 13:14:26 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.98.2) (envelope-from ) id 1x17SI-00000000s1l-2kjU; Mon, 31 Aug 2026 13:14:06 -0600 From: Logan Gunthorpe To: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, dmaengine@vger.kernel.org, Vinod Koul Cc: Frank Li , Kelvin Cao , =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , Dave Jiang , George Ge , Jaeyoung Chung , Logan Gunthorpe , Sashiko , Frank Li Date: Mon, 31 Aug 2026 13:13:59 -0600 Message-ID: <20260831191403.207631-10-logang@deltatee.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260831191403.207631-1-logang@deltatee.com> References: <20260831191403.207631-1-logang@deltatee.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 172.16.1.31 X-SA-Exim-Rcpt-To: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, dmaengine@vger.kernel.org, linux@weissschuh.net, dave.jiang@intel.com, kelvin.cao@microchip.com, george.ge@microchip.com, jjy600901@snu.ac.kr, logang@deltatee.com, vkoul@kernel.org, sashiko-bot@kernel.org, Frank.li@nxp.com, Frank.Li@nxp.com X-SA-Exim-Mail-From: gunthorp@deltatee.com X-Spam-Level: Subject: [PATCH v5 09/12] dmaengine: switchtec-dma: fix use-after-free of swdma_dev in remove() X-SA-Exim-Version: 4.2.1 (built Sun, 23 Feb 2025 07:57:16 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) dma_async_device_unregister() can drop the last reference on dma_dev and free swdma_dev synchronously via switchtec_dma_release(), but switchtec_dma_remove() then uses swdma_dev->bar for iounmap(). Cache bar in a local variable before the unregister call. Reported-by: Sashiko Link: https://lore.kernel.org/dmaengine/20260717223431.625EE1F000E9@smtp.kernel.org Reviewed-by: Frank Li Signed-off-by: Logan Gunthorpe --- drivers/dma/switchtec_dma.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/dma/switchtec_dma.c b/drivers/dma/switchtec_dma.c index c2803af6589d..3b4ec4ad2bbe 100644 --- a/drivers/dma/switchtec_dma.c +++ b/drivers/dma/switchtec_dma.c @@ -1393,6 +1393,7 @@ static int switchtec_dma_probe(struct pci_dev *pdev, static void switchtec_dma_remove(struct pci_dev *pdev) { struct switchtec_dma_dev *swdma_dev = pci_get_drvdata(pdev); + void __iomem *bar = swdma_dev->bar; switchtec_dma_chans_release(pdev, swdma_dev); @@ -1405,7 +1406,7 @@ static void switchtec_dma_remove(struct pci_dev *pdev) dma_async_device_unregister(&swdma_dev->dma_dev); - iounmap(swdma_dev->bar); + iounmap(bar); pci_release_mem_regions(pdev); pci_disable_device(pdev); } -- 2.47.3