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=-9.1 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 CE448C31E4B for ; Fri, 14 Jun 2019 20:36:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9B90C217F9 for ; Fri, 14 Jun 2019 20:36:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560544569; bh=1XWVcna6ibM0e624qpjkh6BRvMNG84hwCnjcEQh/zcg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=rCmVl6KZ4mTGrP69ABPjksPkgD3Lb6o0C7FS6y0f+eU+Xh97DeotmR3u9NE/Y8F0T RsS7fu3ROPMAiO1F+vwZS1ObVJLd+4oGIW8XN2+uTtYUrBegCkfxKpXiN/ujMyTNzR WYp8x5qWdjfKKoZZgirM2Adn3MzExSClWkolupuQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727179AbfFNUgF (ORCPT ); Fri, 14 Jun 2019 16:36:05 -0400 Received: from mail.kernel.org ([198.145.29.99]:52090 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727177AbfFNU3t (ORCPT ); Fri, 14 Jun 2019 16:29:49 -0400 Received: from sasha-vm.mshome.net (unknown [131.107.159.134]) (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 8DEEE21848; Fri, 14 Jun 2019 20:29:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560544188; bh=1XWVcna6ibM0e624qpjkh6BRvMNG84hwCnjcEQh/zcg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LcG0ULtSlJS2kIxIiZPHuKHmsykL78+DEWpejEbQMm+r+xXJWXAOs0wHeAJRN29Q4 PYgkIWS4RK0zcPc1ZdVvh+g7hy4tloZuZR1e0tznP2BAM669kZBadvn/rIJvJAkClS krnBxsClz360GxuRBtgWUy6xECTsjjlBq0D3dx30= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Colin Ian King , Vinod Koul , Sasha Levin , dmaengine@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 02/39] dmaengine: dw-axi-dmac: fix null dereference when pointer first is null Date: Fri, 14 Jun 2019 16:29:07 -0400 Message-Id: <20190614202946.27385-2-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190614202946.27385-1-sashal@kernel.org> References: <20190614202946.27385-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org From: Colin Ian King [ Upstream commit 0788611c9a0925c607de536b2449de5ed98ef8df ] In the unlikely event that axi_desc_get returns a null desc in the very first iteration of the while-loop the error exit path ends up calling axi_desc_put on a null pointer 'first' and this causes a null pointer dereference. Fix this by adding a null check on pointer 'first' before calling axi_desc_put. Addresses-Coverity: ("Explicit null dereference") Fixes: 1fe20f1b8454 ("dmaengine: Introduce DW AXI DMAC driver") Signed-off-by: Colin Ian King Signed-off-by: Vinod Koul Signed-off-by: Sasha Levin --- drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c index c4eb55e3011c..c05ef7f1d7b6 100644 --- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c +++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c @@ -512,7 +512,8 @@ dma_chan_prep_dma_memcpy(struct dma_chan *dchan, dma_addr_t dst_adr, return vchan_tx_prep(&chan->vc, &first->vd, flags); err_desc_get: - axi_desc_put(first); + if (first) + axi_desc_put(first); return NULL; } -- 2.20.1