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Sat, 17 Aug 2019 06:52:04 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x7H6nFi3153042; Sat, 17 Aug 2019 06:52:04 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserp3020.oracle.com with ESMTP id 2ue9dsm3um-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 17 Aug 2019 06:52:04 +0000 Received: from abhmp0002.oracle.com (abhmp0002.oracle.com [141.146.116.8]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x7H6pvHW029889; Sat, 17 Aug 2019 06:51:58 GMT Received: from kadam (/41.57.98.10) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 16 Aug 2019 23:51:57 -0700 Date: Sat, 17 Aug 2019 09:51:46 +0300 From: Dan Carpenter To: Colin King Cc: Harry Wentland , Leo Li , Alex Deucher , Christian =?iso-8859-1?Q?K=F6nig?= , David Zhou , David Airlie , Daniel Vetter , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH][drm-next] drm/amd/display: fix a potential null pointer dereference Message-ID: <20190817065146.GA4451@kadam> References: <20190816221011.10750-1-colin.king@canonical.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190816221011.10750-1-colin.king@canonical.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9351 signatures=668684 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908170073 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9351 signatures=668684 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908170073 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Aug 16, 2019 at 11:10:11PM +0100, Colin King wrote: > From: Colin Ian King > > Currently the pointer init_data is dereferenced on the assignment > of fw_info before init_data is sanity checked to see if it is null. > Fix te potential null pointer dereference on init_data by only > performing dereference after it is null checked. > > Addresses-Coverity: ("Dereference before null check") > Fixes: 9adc8050bf3c ("drm/amd/display: make firmware info only load once during dc_bios create") > Signed-off-by: Colin Ian King > --- > drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c b/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c > index bee81bf288be..926954c804a6 100644 > --- a/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c > +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c > @@ -1235,7 +1235,7 @@ static bool calc_pll_max_vco_construct( > struct calc_pll_clock_source_init_data *init_data) > { > uint32_t i; > - struct dc_firmware_info *fw_info = &init_data->bp->fw_info; > + struct dc_firmware_info *fw_info; > if (calc_pll_cs == NULL || > init_data == NULL || > init_data->bp == NULL) init_data can't be NULL. I'm mostly pointing this out because that NULL check is written so higgledy-piggledy. At first I thought this was staging code so I was planning to ignore the patch. :P regards, dan carpenter