From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 4DF371863 for ; Wed, 28 Dec 2022 15:37:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C5859C433D2; Wed, 28 Dec 2022 15:37:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1672241852; bh=QojJVyt77FT8ZU9gk/lUuJ9cIu9f+wBThYUjDEo6nDU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pPzMXmXNDnUz10zxmrbracnJ/3MN+C0fcVSI4296NyOm0onrnzEr8HIdBHuNtQ6my AIHIjCIPLOW+R1UBAr0ZMT6hRCZCfLEMRhygIo2P0C5Qh+5IgCNkvm85KJgJcrpsg6 o2DXmtzU+em+LED9c8jkEsGyyd22KiYr9azVZkSw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jernej Skrabec , Joerg Roedel , Sasha Levin Subject: [PATCH 5.15 530/731] iommu/sun50i: Fix R/W permission check Date: Wed, 28 Dec 2022 15:40:37 +0100 Message-Id: <20221228144311.906241144@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20221228144256.536395940@linuxfoundation.org> References: <20221228144256.536395940@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Jernej Skrabec [ Upstream commit eac0104dc69be50bed86926d6f32e82b44f8c921 ] Because driver has enum type permissions and iommu subsystem has bitmap type, we have to be careful how check for combined read and write permissions is done. In such case, we have to mask both permissions and check that both are set at the same time. Current code just masks both flags but doesn't check that both are set. In short, it always sets R/W permission, regardles if requested permissions were RO, WO or RW. Fix that. Fixes: 4100b8c229b3 ("iommu: Add Allwinner H6 IOMMU driver") Signed-off-by: Jernej Skrabec Link: https://lore.kernel.org/r/20221025165415.307591-4-jernej.skrabec@gmail.com Signed-off-by: Joerg Roedel Signed-off-by: Sasha Levin --- drivers/iommu/sun50i-iommu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/iommu/sun50i-iommu.c b/drivers/iommu/sun50i-iommu.c index 5b87672c689f..16bfba1faee1 100644 --- a/drivers/iommu/sun50i-iommu.c +++ b/drivers/iommu/sun50i-iommu.c @@ -271,7 +271,7 @@ static u32 sun50i_mk_pte(phys_addr_t page, int prot) enum sun50i_iommu_aci aci; u32 flags = 0; - if (prot & (IOMMU_READ | IOMMU_WRITE)) + if ((prot & (IOMMU_READ | IOMMU_WRITE)) == (IOMMU_READ | IOMMU_WRITE)) aci = SUN50I_IOMMU_ACI_RD_WR; else if (prot & IOMMU_READ) aci = SUN50I_IOMMU_ACI_RD; -- 2.35.1