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X-IronPort-AV: E=McAfee;i="6600,9927,10876"; a="384990201" X-IronPort-AV: E=Sophos;i="6.03,256,1694761200"; d="scan'208";a="384990201" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Oct 2023 07:47:48 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10876"; a="1090946608" X-IronPort-AV: E=Sophos;i="6.03,256,1694761200"; d="scan'208";a="1090946608" Received: from dhanlon-mobl1.ger.corp.intel.com (HELO [10.213.221.114]) ([10.213.221.114]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Oct 2023 07:47:45 -0700 Message-ID: <4d850f3c-c199-470f-b83e-00bd9fddbd7a@linux.intel.com> Date: Fri, 27 Oct 2023 15:47:43 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] i915/perf: Fix NULL deref bugs with drm_dbg() calls Content-Language: en-US To: Andrzej Hajda , Harshit Mogalapalli , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , David Airlie , Daniel Vetter , Umesh Nerlige Ramappa , Lionel Landwerlin , Matt Roper , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Cc: dan.carpenter@linaro.org, kernel-janitors@vger.kernel.org, error27@gmail.com References: <20231027140729.2505993-1-harshit.m.mogalapalli@oracle.com> <1e844f00-fc16-4788-8d90-ebe115eb9313@intel.com> From: Tvrtko Ursulin Organization: Intel Corporation UK Plc In-Reply-To: <1e844f00-fc16-4788-8d90-ebe115eb9313@intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=0.2 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,HK_RANDOM_FROM, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on howler.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (howler.vger.email [0.0.0.0]); Fri, 27 Oct 2023 07:48:23 -0700 (PDT) On 27/10/2023 15:11, Andrzej Hajda wrote: > On 27.10.2023 16:07, Harshit Mogalapalli wrote: >> When i915 perf interface is not available dereferencing it will lead to >> NULL dereferences. >> >> Fix this by using DRM_DEBUG() which the scenario before the commit in >> the Fixes tag. >> >> Fixes: 2fec539112e8 ("i915/perf: Replace DRM_DEBUG with driver >> specific drm_dbg call") >> Signed-off-by: Harshit Mogalapalli > > > Reviewed-by: Andrzej Hajda Please hold off merging. >> --- >> This is found using smatch(static analysis tool), only compile tested. >> --- >>   drivers/gpu/drm/i915/i915_perf.c | 9 +++------ >>   1 file changed, 3 insertions(+), 6 deletions(-) >> >> diff --git a/drivers/gpu/drm/i915/i915_perf.c >> b/drivers/gpu/drm/i915/i915_perf.c >> index 2f3ecd7d4804..bb48c96b7950 100644 >> --- a/drivers/gpu/drm/i915/i915_perf.c >> +++ b/drivers/gpu/drm/i915/i915_perf.c >> @@ -4228,8 +4228,7 @@ int i915_perf_open_ioctl(struct drm_device *dev, >> void *data, >>       int ret; >>       if (!perf->i915) { >> -        drm_dbg(&perf->i915->drm, >> -            "i915 perf interface not available for this system\n"); >> +        DRM_DEBUG("i915 perf interface not available for this >> system\n"); What's that struct drm_device *dev function argument a few lines up? :) Although TBH all these these could just be removed since I doubt they are adding any value and ENOTSUPP is pretty clear. Regards, Tvrtko >>           return -ENOTSUPP; >>       } >> @@ -4608,8 +4607,7 @@ int i915_perf_add_config_ioctl(struct drm_device >> *dev, void *data, >>       int err, id; >>       if (!perf->i915) { >> -        drm_dbg(&perf->i915->drm, >> -            "i915 perf interface not available for this system\n"); >> +        DRM_DEBUG("i915 perf interface not available for this >> system\n"); >>           return -ENOTSUPP; >>       } >> @@ -4774,8 +4772,7 @@ int i915_perf_remove_config_ioctl(struct >> drm_device *dev, void *data, >>       int ret; >>       if (!perf->i915) { >> -        drm_dbg(&perf->i915->drm, >> -            "i915 perf interface not available for this system\n"); >> +        DRM_DEBUG("i915 perf interface not available for this >> system\n"); >>           return -ENOTSUPP; >>       } >