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Wed, 05 Feb 2020 16:55:49 +0000 Received: from b03ledav006.gho.boulder.ibm.com (b03ledav006.gho.boulder.ibm.com [9.17.130.237]) by b03cxnp07029.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 015GtmHr11338068 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 5 Feb 2020 16:55:48 GMT Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5E96BC6063; Wed, 5 Feb 2020 16:55:48 +0000 (GMT) Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 34DA6C605A; Wed, 5 Feb 2020 16:55:48 +0000 (GMT) Received: from localhost (unknown [9.41.100.106]) by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP; Wed, 5 Feb 2020 16:55:48 +0000 (GMT) From: Nathan Lynch To: Michal Suchanek Subject: Re: [PATCH v2] powerpc: drmem: avoid NULL pointer dereference when drmem is unavailable In-Reply-To: <20200131132829.10281-1-msuchanek@suse.de> References: <20200131132829.10281-1-msuchanek@suse.de> Date: Wed, 05 Feb 2020 10:55:47 -0600 Message-ID: <87r1z92cto.fsf@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138, 18.0.572 definitions=2020-02-05_05:2020-02-04, 2020-02-05 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 suspectscore=1 spamscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 mlxscore=0 clxscore=1011 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002050128 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: David Hildenbrand , Libor Pechacek , linux-kernel@vger.kernel.org, stable@vger.kernel.org, Michal Suchanek , Paul Mackerras , Leonardo Bras , Thomas Gleixner , Michal Suchanek , linuxppc-dev@lists.ozlabs.org, Allison Randal Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Michal Suchanek writes: > From: Libor Pechacek > > In guests without hotplugagble memory drmem structure is only zero > initialized. Trying to manipulate DLPAR parameters results in a crash. > [...] > > Fixes: 6c6ea53725b3 ("powerpc/mm: Separate ibm, dynamic-memory data from DT format") > Cc: Michal Suchanek > Cc: stable@vger.kernel.org > Signed-off-by: Libor Pechacek > Signed-off-by: Michal Suchanek > --- > v2: rename last_lmb -> limit, clarify error condition. Acked-by: Nathan Lynch Thanks!