From patchwork Wed Aug 4 14:27:26 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dafna Hirschfeld X-Patchwork-Id: 12419125 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 28F88C4320E for ; Wed, 4 Aug 2021 14:31:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 121E360E97 for ; Wed, 4 Aug 2021 14:31:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238793AbhHDObL (ORCPT ); Wed, 4 Aug 2021 10:31:11 -0400 Received: from bhuna.collabora.co.uk ([46.235.227.227]:39618 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238782AbhHDO24 (ORCPT ); Wed, 4 Aug 2021 10:28:56 -0400 Received: from guri.fritz.box (unknown [IPv6:2a02:810a:880:f54:adf4:1f5e:19c9:b75f]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: dafna) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id 9310C1F43A2B; Wed, 4 Aug 2021 15:27:48 +0100 (BST) From: Dafna Hirschfeld To: linux-media@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org Cc: dafna.hirschfeld@collabora.com, hverkuil@xs4all.nl, kernel@collabora.com, dafna3@gmail.com, mchehab@kernel.org, tfiga@chromium.org, tiffany.lin@mediatek.com, andrew-ct.chen@mediatek.com, matthias.bgg@gmail.com, hsinyi@chromium.org, maoguang.meng@mediatek.com, irui.wang@mediatek.com, acourbot@chromium.org, Yunfei.Dong@mediatek.com, yong.wu@mediatek.com, eizan@chromium.org Subject: [PATCH 2/5] media: mtk-vcodec: call v4l2_m2m_ctx_release first when file is released Date: Wed, 4 Aug 2021 16:27:26 +0200 Message-Id: <20210804142729.7231-3-dafna.hirschfeld@collabora.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210804142729.7231-1-dafna.hirschfeld@collabora.com> References: <20210804142729.7231-1-dafna.hirschfeld@collabora.com> Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org The func v4l2_m2m_ctx_release waits for currently running jobs to finish and then stop streaming both queues and frees the buffers. All this should be done before the call to mtk_vcodec_enc_release which frees the encoder handler. This fixes use-after-free bug. Fixes: 4e855a6efa547 ("[media] vcodec: mediatek: Add Mediatek V4L2 Video Encoder Driver") Signed-off-by: Dafna Hirschfeld --- drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c index 45d1870c83dd..4ced20ca647b 100644 --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c @@ -218,11 +218,11 @@ static int fops_vcodec_release(struct file *file) mtk_v4l2_debug(1, "[%d] encoder", ctx->id); mutex_lock(&dev->dev_mutex); + v4l2_m2m_ctx_release(ctx->m2m_ctx); mtk_vcodec_enc_release(ctx); v4l2_fh_del(&ctx->fh); v4l2_fh_exit(&ctx->fh); v4l2_ctrl_handler_free(&ctx->ctrl_hdl); - v4l2_m2m_ctx_release(ctx->m2m_ctx); list_del_init(&ctx->list); kfree(ctx);