From patchwork Thu Aug 16 14:03:55 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shubhrajyoti Datta X-Patchwork-Id: 1332831 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork1.kernel.org (Postfix) with ESMTP id 3A71940210 for ; Thu, 16 Aug 2012 14:18:31 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1T20pU-0003RO-VV; Thu, 16 Aug 2012 14:13:46 +0000 Received: from devils.ext.ti.com ([198.47.26.153]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1T20h5-000600-UZ for linux-arm-kernel@lists.infradead.org; Thu, 16 Aug 2012 14:05:05 +0000 Received: from dbdp20.itg.ti.com ([172.24.170.38]) by devils.ext.ti.com (8.13.7/8.13.7) with ESMTP id q7GE4A1q028307; Thu, 16 Aug 2012 09:04:11 -0500 Received: from DBDE71.ent.ti.com (localhost [127.0.0.1]) by dbdp20.itg.ti.com (8.13.8/8.13.8) with ESMTP id q7GE49Q7025947; Thu, 16 Aug 2012 19:34:09 +0530 (IST) Received: from dbdp32.itg.ti.com (172.24.170.251) by DBDE71.ent.ti.com (172.24.170.149) with Microsoft SMTP Server id 14.1.323.3; Thu, 16 Aug 2012 19:34:09 +0530 Received: from ula0393217.india.ti.com (smtpvbd.itg.ti.com [172.24.170.250]) by dbdp32.itg.ti.com (8.13.8/8.13.8) with ESMTP id q7GE44L3027608; Thu, 16 Aug 2012 19:34:09 +0530 From: Shubhrajyoti D To: Subject: [PATCHv7 24/24] i2c: omap: Prevent NULL pointer dereference in remove Date: Thu, 16 Aug 2012 19:33:55 +0530 Message-ID: <1345125835-15524-25-git-send-email-shubhrajyoti@ti.com> X-Mailer: git-send-email 1.7.5.4 In-Reply-To: <1345125835-15524-1-git-send-email-shubhrajyoti@ti.com> References: <1345125835-15524-1-git-send-email-shubhrajyoti@ti.com> MIME-Version: 1.0 X-Spam-Note: CRM114 invocation failed X-Spam-Score: -6.9 (------) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-6.9 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/, high trust [198.47.26.153 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: tony@atomide.com, w.sang@pengutronix.de, linux-i2c@vger.kernel.org, ben-linux@fluff.org, Shubhrajyoti D , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Prevent the NULL pointer access of pdev. The platform_device is anyways deleted so remove platform_set_drvdata(pdev, NULL);. [ 654.961761] Unable to handle kernel NULL pointer dereference at virtual address 00000070 [ 654.970611] pgd = df254000 [ 654.973480] [00000070] *pgd=9f1da831, *pte=00000000, *ppte=00000000 [ 654.980163] Internal error: Oops: 17 [#1] SMP ARM [ 654.985076] Modules linked in: [ 654.988281] CPU: 1 Not tainted (3.6.0-rc1-00031-ge547de1-dirty #339) [ 654.995330] PC is at omap_i2c_runtime_resume+0x8/0x148 [ 655.000732] LR is at omap_i2c_runtime_resume+0x8/0x148 Signed-off-by: Shubhrajyoti D --- drivers/i2c/busses/i2c-omap.c | 4 ---- 1 files changed, 0 insertions(+), 4 deletions(-) diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 3df6f92..9aefd36 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -1207,8 +1207,6 @@ err_unuse_clocks: pm_runtime_put(dev->dev); pm_runtime_disable(&pdev->dev); err_free_mem: - platform_set_drvdata(pdev, NULL); - return r; } @@ -1217,8 +1215,6 @@ static int __devexit omap_i2c_remove(struct platform_device *pdev) struct omap_i2c_dev *dev = platform_get_drvdata(pdev); int ret; - platform_set_drvdata(pdev, NULL); - i2c_del_adapter(&dev->adapter); ret = pm_runtime_get_sync(&pdev->dev); if (IS_ERR_VALUE(ret))