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=-7.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED autolearn=ham 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 C07B8C282CE for ; Tue, 4 Jun 2019 10:32:54 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 9647A245C5 for ; Tue, 4 Jun 2019 10:32:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="d0UyFRPg" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9647A245C5 Authentication-Results: mail.kernel.org; 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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hY6kM-0003Xu-UN; Tue, 04 Jun 2019 10:32:50 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hY6kJ-0003Ws-Qf for linux-arm-kernel@lists.infradead.org; Tue, 04 Jun 2019 10:32:49 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 7184C80D; Tue, 4 Jun 2019 03:32:46 -0700 (PDT) Received: from [10.1.197.61] (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id E84873F246; Tue, 4 Jun 2019 03:32:44 -0700 (PDT) Subject: Re: [PATCH] irqchip: ti-sci-inta: Fix kernel crash if irq_create_fwspec_mapping fail To: Peter Ujfalusi , lokeshvutla@ti.com, tglx@linutronix.de, jason@lakedaemon.net References: <20190604101751.8265-1-peter.ujfalusi@ti.com> From: Marc Zyngier Openpgp: preference=signencrypt Autocrypt: addr=marc.zyngier@arm.com; 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Linux aarch64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190604101751.8265-1-peter.ujfalusi@ti.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190604_033247_878165_62E8D5DD X-CRM114-Status: GOOD ( 17.14 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: nm@ti.com, t-kristo@ti.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, ssantosh@kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 04/06/2019 11:17, Peter Ujfalusi wrote: > irq_create_fwspec_mapping() can fail, returning 0 as parent_virq. In this > case vint_desc is going to be NULL in ti_sci_inta_alloc_irq() which will > cause NULL pointer dereference. > > Also note that irq_create_fwspec_mapping() returns 'unsigned int' so the > check '<=' was wrong. > > Use -EINVAL if irq_create_fwspec_mapping() returned with 0. > > Signed-off-by: Peter Ujfalusi > --- > drivers/irqchip/irq-ti-sci-inta.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/irqchip/irq-ti-sci-inta.c b/drivers/irqchip/irq-ti-sci-inta.c > index 011b60a49e3f..ef4d625d2d80 100644 > --- a/drivers/irqchip/irq-ti-sci-inta.c > +++ b/drivers/irqchip/irq-ti-sci-inta.c > @@ -159,9 +159,9 @@ static struct ti_sci_inta_vint_desc *ti_sci_inta_alloc_parent_irq(struct irq_dom > parent_fwspec.param[1] = vint_desc->vint_id; > > parent_virq = irq_create_fwspec_mapping(&parent_fwspec); > - if (parent_virq <= 0) { > + if (parent_virq == 0) { > kfree(vint_desc); > - return ERR_PTR(parent_virq); > + return ERR_PTR(-EINVAL); > } > vint_desc->parent_virq = parent_virq; > > Nice one. I've queued it as part of the stuff I need to send to Thomas at the end of the week. Thanks, M. -- Jazz is not dead. It just smells funny... _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel