From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6F61CC43331 for ; Sun, 10 Nov 2019 02:49:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3A947229EF for ; Sun, 10 Nov 2019 02:49:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573354199; bh=eGfE6SgmCLBEH7KuVge+NgvgK1bshcL4bLGOD+896oU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ZrsyMyLWDgcbb0sUCVSs/KA+Gkfif9m9zHlOXe6nOV2UldkuI/U93dVIpmjHUmAR7 rMmimMlMRNkVUUoAIbv+f6WDZS8PNP5+duw6H7lTC5k3jdAkEtPtLoDpH8L0s+na8V DNZMmcc4UiGAyFafaWghKYUI8k+Evm6Xg9aX+4nM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728555AbfKJCt6 (ORCPT ); Sat, 9 Nov 2019 21:49:58 -0500 Received: from mail.kernel.org ([198.145.29.99]:59586 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729509AbfKJCtk (ORCPT ); Sat, 9 Nov 2019 21:49:40 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7319522593; Sun, 10 Nov 2019 02:49:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573354180; bh=eGfE6SgmCLBEH7KuVge+NgvgK1bshcL4bLGOD+896oU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Y4FO+4VzAy4Gmb+QL8DRh1pJC2ECwA9GVOK+B4bOHhVpoqIV836dwUapAFxoxl5ER 2E+YR/c2UNrqfxYzX35gFuLtHntjDEsizIt+oanhErWg6v3uM68/+r5uDg+DXiDpWx lVxfRjja5oFFfg1189p/gtAVERMFnEyL4/jiux6A= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jia-Ju Bai , Hans Verkuil , Mauro Carvalho Chehab , Sasha Levin , linux-media@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 30/66] media: pci: ivtv: Fix a sleep-in-atomic-context bug in ivtv_yuv_init() Date: Sat, 9 Nov 2019 21:48:09 -0500 Message-Id: <20191110024846.32598-30-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191110024846.32598-1-sashal@kernel.org> References: <20191110024846.32598-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jia-Ju Bai [ Upstream commit 8d11eb847de7d89c2754988c944d51a4f63e219b ] The driver may sleep in a interrupt handler. The function call paths (from bottom to top) in Linux-4.16 are: [FUNC] kzalloc(GFP_KERNEL) drivers/media/pci/ivtv/ivtv-yuv.c, 938: kzalloc in ivtv_yuv_init drivers/media/pci/ivtv/ivtv-yuv.c, 960: ivtv_yuv_init in ivtv_yuv_next_free drivers/media/pci/ivtv/ivtv-yuv.c, 1126: ivtv_yuv_next_free in ivtv_yuv_setup_stream_frame drivers/media/pci/ivtv/ivtv-irq.c, 827: ivtv_yuv_setup_stream_frame in ivtv_irq_dec_data_req drivers/media/pci/ivtv/ivtv-irq.c, 1013: ivtv_irq_dec_data_req in ivtv_irq_handler To fix this bug, GFP_KERNEL is replaced with GFP_ATOMIC. This bug is found by my static analysis tool DSAC. Signed-off-by: Jia-Ju Bai Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/pci/ivtv/ivtv-yuv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/pci/ivtv/ivtv-yuv.c b/drivers/media/pci/ivtv/ivtv-yuv.c index f7299d3d82449..bcb51e87c72f0 100644 --- a/drivers/media/pci/ivtv/ivtv-yuv.c +++ b/drivers/media/pci/ivtv/ivtv-yuv.c @@ -935,7 +935,7 @@ static void ivtv_yuv_init(struct ivtv *itv) } /* We need a buffer for blanking when Y plane is offset - non-fatal if we can't get one */ - yi->blanking_ptr = kzalloc(720 * 16, GFP_KERNEL|__GFP_NOWARN); + yi->blanking_ptr = kzalloc(720 * 16, GFP_ATOMIC|__GFP_NOWARN); if (yi->blanking_ptr) { yi->blanking_dmaptr = pci_map_single(itv->pdev, yi->blanking_ptr, 720*16, PCI_DMA_TODEVICE); } else { -- 2.20.1