Message ID | 20221112070612.2121535-1-harshit.m.mogalapalli@oracle.com |
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State | New |
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Bottomley" <jejb@linux.ibm.com>, "Martin K. Petersen" <martin.petersen@oracle.com>, Damien Le Moal <damien.lemoal@opensource.wdc.com>, "Shin'ichiro Kawasaki" <shinichiro.kawasaki@wdc.com>, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] scsi: scsi_debug: Fix a warning in resp_report_zones() Date: Fri, 11 Nov 2022 23:06:12 -0800 Message-Id: <20221112070612.2121535-1-harshit.m.mogalapalli@oracle.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-11-12_04,2022-11-11_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 bulkscore=0 mlxscore=0 phishscore=0 suspectscore=0 spamscore=0 adultscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2211120052 X-Proofpoint-GUID: _-QZLeS_QsXhNYb9UiRvH303FBZ5kin_ X-Proofpoint-ORIG-GUID: _-QZLeS_QsXhNYb9UiRvH303FBZ5kin_ X-Spam-Status: No, score=-2.8 required=5.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: <linux-kernel.vger.kernel.org> X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1749274809338029955?= X-GMAIL-MSGID: =?utf-8?q?1749274809338029955?= |
Series |
scsi: scsi_debug: Fix a warning in resp_report_zones()
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Commit Message
Harshit Mogalapalli
Nov. 12, 2022, 7:06 a.m. UTC
As 'alloc_len' is user controlled data, if user tries to allocate memory
larger than(>=) MAX_ORDER, then kcalloc() will fail, it creates a stack
trace and messes up dmesg with a warning.
Add __GFP_NOWARN in order to avoid too large allocation warning.
This is detected by static analysis using smatch.
Fixes: 7db0e0c8190a ("scsi: scsi_debug: Fix buffer size of REPORT ZONES command")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
---
drivers/scsi/scsi_debug.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Comments
Harshit, > As 'alloc_len' is user controlled data, if user tries to allocate memory > larger than(>=) MAX_ORDER, then kcalloc() will fail, it creates a stack > trace and messes up dmesg with a warning. Applied to 6.2/scsi-staging, thanks!
On Fri, 11 Nov 2022 23:06:12 -0800, Harshit Mogalapalli wrote: > As 'alloc_len' is user controlled data, if user tries to allocate memory > larger than(>=) MAX_ORDER, then kcalloc() will fail, it creates a stack > trace and messes up dmesg with a warning. > > Add __GFP_NOWARN in order to avoid too large allocation warning. > This is detected by static analysis using smatch. > > [...] Applied to 6.2/scsi-queue, thanks! [1/1] scsi: scsi_debug: Fix a warning in resp_report_zones() https://git.kernel.org/mkp/scsi/c/07f2ca139d9a
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index 697fc57bc711..eaa726654be2 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -4497,7 +4497,7 @@ static int resp_report_zones(struct scsi_cmnd *scp, rep_max_zones = (alloc_len - 64) >> ilog2(RZONES_DESC_HD); - arr = kzalloc(alloc_len, GFP_ATOMIC); + arr = kzalloc(alloc_len, GFP_ATOMIC | __GFP_NOWARN); if (!arr) { mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC, INSUFF_RES_ASCQ);