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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CBC26C43458 for ; Wed, 1 Jul 2026 05:50:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=YM/kzkdd2b4wz0/QuPV8d4m9Lm+x6hpDFjkd4v2KLO4=; b=EDdFUmeOe3ZiEhh2I59YkK5BQX /I91Zie1PlHj/IhgegqMpAHALK+5D2ijhx+h95xKn+qlajBOCiEB2+SQUfDPl9aW34uL1Xx2QY9Cl gy1QlYBrqIHBCObB6oi2/Z9Brw5HvVrIOQL97xuDJLNyXD0G9K5ixPCNB5SVVkHJ897VRFS1gUGl9 5S1CCcatatp9eHAjWOJ1f6e0UHaqQ0pUbMGZaRtk+XEXgNB2c56p2RPAcO+hIGjsB2TGnOedhRUx0 6OQUCA/GDVQbnUqIsPLAEO2DC4z9gI+QOdMDkLV5DSQfbzQkoGm1i4IWtFr92TtxSPaVZSsxmPKqZ DZN1Wtqg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wenpo-00000000hv4-3qoI; Wed, 01 Jul 2026 05:50:08 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wenpn-00000000huV-2qa9 for linux-arm-kernel@lists.infradead.org; Wed, 01 Jul 2026 05:50:08 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id CD2F66001D; Wed, 1 Jul 2026 05:50:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 628A81F00A3E; Wed, 1 Jul 2026 05:49:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782885006; bh=YM/kzkdd2b4wz0/QuPV8d4m9Lm+x6hpDFjkd4v2KLO4=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=oVUePrtdGdfcHjX+cljzkAXWX8yQtKPyHxYbs9+rDOOIfIvI8HQob1dUJF+TOW/y0 fC5sqXl8TCTqr/8FrheOkNk8daMgGh8mpyaLj/+fVYuN40wIzhFqgHFJqQqshM2AAZ QmS72TRjtqkOOrJbTcnATbGlXL4fSZouBBLMvDsNWlaDXpAHcdKnbWVdTCKxRWvKLi FTiOEZh/3FHlbfRr7w7c+MZ7DEEe6AFLEpev1I+D+hE0x8kTOk80LKi5+7NbwXm/+H JynSNQfMR3DglTV2+o+PCwvEpadWmlRiKgqn7fA8aS8g9TTAXMf6o7W7ysUHuYt6E1 ytVN3wRJb/NYQ== From: "Aneesh Kumar K.V (Arm)" To: iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev Cc: "Aneesh Kumar K.V (Arm)" , Robin Murphy , Marek Szyprowski , Will Deacon , Marc Zyngier , Steven Price , Suzuki K Poulose , Catalin Marinas , Jiri Pirko , Jason Gunthorpe , Mostafa Saleh , Petr Tesarik , Alexey Kardashevskiy , Dan Williams , Xu Yilun , linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , x86@kernel.org, Michael Kelley Subject: [PATCH v7 02/22] dma-pool: fix page leak in atomic_pool_expand() cleanup Date: Wed, 1 Jul 2026 11:19:06 +0530 Message-ID: <20260701054926.825925-3-aneesh.kumar@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260701054926.825925-1-aneesh.kumar@kernel.org> References: <20260701054926.825925-1-aneesh.kumar@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org atomic_pool_expand() frees the allocated pages from the remove_mapping error path only when CONFIG_DMA_DIRECT_REMAP is enabled. When CONFIG_DMA_DIRECT_REMAP is disabled, failures after page allocation, such as gen_pool_add_virt(), jump to remove_mapping and return without freeing the pages. Move __free_pages(page, order) out of the CONFIG_DMA_DIRECT_REMAP block so that cleanup paths always release the allocation. Tested-by: Michael Kelley Tested-by: Mostafa Saleh Signed-off-by: Aneesh Kumar K.V (Arm) --- kernel/dma/pool.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c index 2b2fbb709242..b0303efbc153 100644 --- a/kernel/dma/pool.c +++ b/kernel/dma/pool.c @@ -81,6 +81,7 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size, { unsigned int order; struct page *page = NULL; + bool leak_pages = false; void *addr; int ret = -ENOMEM; @@ -115,8 +116,10 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size, */ ret = set_memory_decrypted((unsigned long)page_to_virt(page), 1 << order); - if (ret) + if (ret) { + leak_pages = true; goto remove_mapping; + } ret = gen_pool_add_virt(pool, (unsigned long)addr, page_to_phys(page), pool_size, NUMA_NO_NODE); if (ret) @@ -130,14 +133,15 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size, 1 << order); if (WARN_ON_ONCE(ret)) { /* Decrypt succeeded but encrypt failed, purposely leak */ - goto out; + leak_pages = true; } remove_mapping: #ifdef CONFIG_DMA_DIRECT_REMAP dma_common_free_remap(addr, pool_size); free_page: - __free_pages(page, order); #endif + if (!leak_pages) + __free_pages(page, order); out: return ret; } -- 2.43.0