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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A8397C46467 for ; Mon, 16 Jan 2023 17:07:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232223AbjAPRHB (ORCPT ); Mon, 16 Jan 2023 12:07:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56966 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232512AbjAPRGm (ORCPT ); Mon, 16 Jan 2023 12:06:42 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9A6CA40BEC for ; Mon, 16 Jan 2023 08:47:51 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id C929AB8108F for ; Mon, 16 Jan 2023 16:47:41 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 25A4CC433EF; Mon, 16 Jan 2023 16:47:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1673887660; bh=XlZJNHhtXi5aAm3yDyXYaVpM8t3/hcKIPK5nJ+W4XnM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KcsIY9RRmpU1o3grLpencYb3h6hQ7hS412HjrmWT2oJ8BpGNbZ4cCdUXb4FURiBEp LL8KGgGUMeBudlGrQ0L4u9dLQ2ZNg1upxawbpJLY18rryVf0W1NEYpkmNReHjvUopJ E579fEOdY9/1yUzHEauG0JN0OzDXyOwdXVhQgA+8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Gaosheng Cui , Herbert Xu , Sasha Levin Subject: [PATCH 4.19 204/521] crypto: img-hash - Fix variable dereferenced before check hdev->req Date: Mon, 16 Jan 2023 16:47:46 +0100 Message-Id: <20230116154856.251261370@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230116154847.246743274@linuxfoundation.org> References: <20230116154847.246743274@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Gaosheng Cui [ Upstream commit 04ba54e5af8f8f0137b08cb51a0b3a2e1ea46c94 ] Smatch report warning as follows: drivers/crypto/img-hash.c:366 img_hash_dma_task() warn: variable dereferenced before check 'hdev->req' Variable dereferenced should be done after check 'hdev->req', fix it. Fixes: d358f1abbf71 ("crypto: img-hash - Add Imagination Technologies hw hash accelerator") Fixes: 10badea259fa ("crypto: img-hash - Fix null pointer exception") Signed-off-by: Gaosheng Cui Signed-off-by: Herbert Xu Signed-off-by: Sasha Levin --- drivers/crypto/img-hash.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/crypto/img-hash.c b/drivers/crypto/img-hash.c index b87000a0a01c..f70923643a97 100644 --- a/drivers/crypto/img-hash.c +++ b/drivers/crypto/img-hash.c @@ -359,12 +359,16 @@ static int img_hash_dma_init(struct img_hash_dev *hdev) static void img_hash_dma_task(unsigned long d) { struct img_hash_dev *hdev = (struct img_hash_dev *)d; - struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req); + struct img_hash_request_ctx *ctx; u8 *addr; size_t nbytes, bleft, wsend, len, tbc; struct scatterlist tsg; - if (!hdev->req || !ctx->sg) + if (!hdev->req) + return; + + ctx = ahash_request_ctx(hdev->req); + if (!ctx->sg) return; addr = sg_virt(ctx->sg); -- 2.35.1