From patchwork Mon May 25 07:35:23 2026 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hongling Zeng X-Patchwork-Id: 2367 Return-Path: X-Original-To: noreply@patchwork.local Delivered-To: noreply@patchwork.local Received: from sto.lore.kernel.org (sto.lore.kernel.org [172.232.135.74]) by mxe881.netcup.net (Postfix) with ESMTPS id ED46A1C0805 for ; Mon, 25 May 2026 09:35:41 +0200 (CEST) Authentication-Results: mxe881; spf=pass (sender IP is 172.232.135.74) smtp.mailfrom=linux-sunxi+bounces-23636-noreply=patchwork.local@lists.linux.dev smtp.helo=sto.lore.kernel.org Received-SPF: pass (mxe881: domain of lists.linux.dev designates 172.232.135.74 as permitted sender) client-ip=172.232.135.74; envelope-from=linux-sunxi+bounces-23636-noreply=patchwork.local@lists.linux.dev; helo=sto.lore.kernel.org; Received: from smtp.subspace.kernel.org (conduit.subspace.kernel.org [100.90.174.1]) by sto.lore.kernel.org (Postfix) with ESMTP id 9C0AA30010EB for ; Mon, 25 May 2026 07:35:39 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 743EC36E469; Mon, 25 May 2026 07:35:37 +0000 (UTC) X-Original-To: linux-sunxi@lists.linux.dev Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (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 ADADA35F176 for ; Mon, 25 May 2026 07:35:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779694537; cv=none; b=mZm6tOQfeTOYn7sE69yOUXLwIF3uGclAI4ixW4A/RDYAGUhhRViyLacIX4oHOh+fBYjXiaeE88aXjM/cS9OOAcU59bLrcbzVSSar2psxi0svyN3ec7YPWH1li1Xsb17J3nLZYYUzPzOKPiMYIcvsNFKm/9t1dPduPwLSYfExI6E= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779694537; c=relaxed/simple; bh=9dvBrkdJfrYfPXnBGL9jqbmpMFwrVe4wBgElwU/t46E=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=JFAC6c3YMAmLQO4j6zQqNMmb72z1i1PBp69I2Ee9Zc4MUQho+KzKHuSZTQb+0z6YJK8IPpRqVyZgMLn+Hl+CaWofTJZ02Zd4+gReRWDBml83MN4mRRyMGyZst5W8IGldJ4uZdKypmxNhb8c75w4qbOj02VFvGFhsBISBw4o/5+E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: 4ce2353a580c11f1aa26b74ffac11d73-20260525 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.12,REQID:17505196-8e3b-48c5-8036-9c076d847c24,IP:0,U RL:0,TC:0,Content:0,EDM:25,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION :release,TS:25 X-CID-META: VersionHash:e7bac3a,CLOUDID:0d366e6f6cfff1987f6fcc35a7a8c5be,BulkI D:nil,BulkQuantity:0,Recheck:0,SF:102|850|865|898,TC:nil,Content:0|15|50,E DM:5,IP:nil,URL:0,File:nil,RT:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA: 0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: 4ce2353a580c11f1aa26b74ffac11d73-20260525 X-User: zenghongling@kylinos.cn Received: from localhost.localdomain [(10.44.16.150)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA with TLSv1.3 TLS_AES_256_GCM_SHA384 256/256) with ESMTP id 168616824; Mon, 25 May 2026 15:35:27 +0800 From: Hongling Zeng To: vkoul@kernel.org, Frank.Li@kernel.org, wens@kernel.org, jernej.skrabec@gmail.com, samuel@sholland.org, mripard@kernel.org, arnd@arndb.de Cc: dmaengine@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org, zhongling0719@126.com, Hongling Zeng Subject: [PATCH] dmaengine: sun6i-dma: Fix use-after-free in error handling paths Date: Mon, 25 May 2026 15:35:23 +0800 Message-Id: <20260525073523.1818653-1-zenghongling@kylinos.cn> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-sunxi@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Rspamd-Server: rspamd-worker-8404 X-Spamd-Result: default: False [-0.66 / 15.00]; BAYES_HAM(-5.50)[99.99%]; RBL_SENDERSCORE(2.00)[172.232.135.74:from]; SUSPICIOUS_RECIPS(1.50)[]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; MAILLIST(-0.15)[generic]; BAD_REP_POLICIES(0.10)[]; MIME_GOOD(-0.10)[text/plain]; HAS_LIST_UNSUB(-0.01)[]; DMARC_NA(0.00)[kylinos.cn]; RCPT_COUNT_TWELVE(0.00)[13]; DBL_BLOCKED_OPENRESOLVER(0.00)[sto.lore.kernel.org:rdns,sto.lore.kernel.org:helo,kylinos.cn:email]; TAGGED_RCPT(0.00)[]; FREEMAIL_CC(0.00)[vger.kernel.org,lists.infradead.org,lists.linux.dev,126.com,kylinos.cn]; FUZZY_BLOCKED(0.00)[rspamd.com]; R_SPF_ALLOW(0.00)[+ip4:172.232.135.74]; PRECEDENCE_BULK(0.00)[]; FORGED_SENDER_MAILLIST(0.00)[]; RCVD_TLS_LAST(0.00)[]; R_DKIM_NA(0.00)[]; FORGED_RECIPIENTS_MAILLIST(0.00)[]; FREEMAIL_TO(0.00)[kernel.org,gmail.com,sholland.org,arndb.de]; FROM_HAS_DN(0.00)[]; ARC_ALLOW(0.00)[subspace.kernel.org:s=arc-20240116:i=1]; TAGGED_FROM(0.00)[bounces-23636-noreply=patchwork.local]; RCVD_COUNT_FIVE(0.00)[5]; MIME_TRACE(0.00)[0:+]; FROM_NEQ_ENVFROM(0.00)[zenghongling@kylinos.cn,linux-sunxi@lists.linux.dev]; ASN(0.00)[asn:63949, ipnet:172.232.128.0/19, country:SG]; TO_DN_SOME(0.00)[] X-Rspamd-Queue-Id: ED46A1C0805 X-MORS-Enabled: yes X-MORS-DOMAIN: patchwork.local X-MORS-HOSTING: hosting172546 X-MORS-USER: hosting172546 X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= In error handling paths, the for loop frees v_lli in the loop body, then accesses v_lli->v_lli_next and v_lli->p_lli_next in the increment expression, which is use-after-free. Fix by saving both the next virtual and physical pointers before freeing the current node. Fixes: 555859308723 ("dmaengine: Add driver for Allwinner sun6i DMA") Signed-off-by: Hongling Zeng --- drivers/dma/sun6i-dma.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c index a9a254dbf8cb..eb9c4ae87ac8 100644 --- a/drivers/dma/sun6i-dma.c +++ b/drivers/dma/sun6i-dma.c @@ -788,9 +788,15 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg( return vchan_tx_prep(&vchan->vc, &txd->vd, flags); err_lli_free: - for (p_lli = txd->p_lli, v_lli = txd->v_lli; v_lli; - p_lli = v_lli->p_lli_next, v_lli = v_lli->v_lli_next) + p_lli = txd->p_lli; + v_lli = txd->v_lli; + while (v_lli) { + struct sun6i_dma_lli *next_v_lli = v_lli->v_lli_next; + dma_addr_t next_p_lli = v_lli->p_lli_next; dma_pool_free(sdev->pool, v_lli, p_lli); + v_lli = next_v_lli; + p_lli = next_p_lli; + } kfree(txd); return NULL; } @@ -869,9 +875,15 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_cyclic( return vchan_tx_prep(&vchan->vc, &txd->vd, flags); err_lli_free: - for (p_lli = txd->p_lli, v_lli = txd->v_lli; v_lli; - p_lli = v_lli->p_lli_next, v_lli = v_lli->v_lli_next) + p_lli = txd->p_lli; + v_lli = txd->v_lli; + while (v_lli) { + struct sun6i_dma_lli *next_v_lli = v_lli->v_lli_next; + dma_addr_t next_p_lli = v_lli->p_lli_next; dma_pool_free(sdev->pool, v_lli, p_lli); + v_lli = next_v_lli; + p_lli = next_p_lli; + } kfree(txd); return NULL; }