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[103.229.18.19]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-36a4294419dsm8607711eec.18.2026.10.30.10.15.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 30 Oct 2026 10:15:42 -0700 (PDT) Message-ID: Date: Fri, 30 Oct 2026 22:45:31 +0530 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 1/6] arm_mpam: Fix the RIS index range check in mpam_ris_create_locked To: Yin Li , James Morse , Rob Herring , Shanker Donthineni , Ben Horgan , Krzysztof Kozlowski , Conor Dooley , Catalin Marinas , Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich , Reinette Chatre , Fenghua Yu , Jonathan Cameron , Bjorn Andersson , Konrad Dybcio , Gavin Shan Cc: Andre Przywara , Drew Fustini , =?UTF-8?Q?Ilpo_J=C3=A4rvinen?= , Shaopeng Tan , trilok.soni@oss.qualcomm.com, aiqun.yu@oss.qualcomm.com, ganapatrao.kulkarni@oss.qualcomm.com, Huang Yiwei , linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, driver-core@lists.linux.dev, devicetree@vger.kernel.org References: <20261028-mpam-resctrl-dt-knp-support-v4-0-bdda1e445cba@oss.qualcomm.com> <20261028-mpam-resctrl-dt-knp-support-v4-1-bdda1e445cba@oss.qualcomm.com> Content-Language: en-US From: Srivathsa L Rao In-Reply-To: <20261028-mpam-resctrl-dt-knp-support-v4-1-bdda1e445cba@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: LY-Ts63zkEJWJZTynKOKeZNHRL5V0F99 X-Proofpoint-ORIG-GUID: LY-Ts63zkEJWJZTynKOKeZNHRL5V0F99 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDMwMDA2OCBTYWx0ZWRfX71w8+yU4FuaG yugBiCbXAj83f79dCXk6own9bbekJqcWH5WFpv0dd5MgWDQRXcD4qTXrE7EH8smz5sb/ySrwl3Q Vr1PyXDFUMs97JRXQnYVhY8qu8aeZbUpGh3KL7TZO8fAkiUsAcbWyP5sYUTzjJojVjw3FTJtReh 34CRtpuQZFoBUTJkdfD5cXK19pZPQcntd6GcTuhP+SP4W1MXoQ+HbdGc2gGj91opzZ8jDYfazye tsFMyP+4dQ9jXNxs5hMdffOYOK53epQmXUst8hA8jnnlEzTUY9oSWKkdi9I6hgDbOnp/yWUxtpS RJlXBH9iAC9Y3Uzy3EU1J46svy1m/BGxCPi+TMtqR3wYjvbD26m+VA9v794wLw7/klcX7d2Zkw1 0nmN560UyOb7wOn29no7eTodAjz/FQb1VhsJTRnGdGj6YpEWemX75Vz8guEyahlRM403cATBWl1 i3OaHpnVOMvNBZ77G7g== X-Authority-Analysis: v=2.4 cv=dPgzC+Zb c=1 sm=1 tr=0 ts=6ae4d0c0 cx=c_pps a=PfFC4Oe2JQzmKTvty2cRDw==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=EUspDBNiAAAA:8 a=7CQSdrXTAAAA:8 a=-Elna7LzL5zmvItKdG0A:9 a=QEXdDO2ut3YA:10 a=6Ab_bkdmUrQuMsNx7PHu:22 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDMwMDA2OCBTYWx0ZWRfX+KwitCmptcgd TZzNAc4ZWCqD0EoPD+2eoKNYf6ztj6WZt4iuM6mlMAFcFJ5gKDkfYJEGxICWAg33XoQihBFvx8V VKKikhhF6Vlp9RCsCtX18UYsD3xRJVo= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-10-30_05,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 impostorscore=0 spamscore=0 malwarescore=0 clxscore=1011 priorityscore=1501 lowpriorityscore=0 phishscore=0 bulkscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610300068 Hi Yin, Reviewed by: Srivathsa L Rao On 10/28/2026 5:15 PM, Yin Li wrote: > The RIS selector field is defined as MPAMCFG_PART_SEL_RIS (bits 27:24), > which is 4 bits wide and gives valid indices 0..15. MPAM_MSC_MAX_NUM_RIS > is defined as 16, so the check should use >= to reject index 16 and > above. The previous > check incorrectly accepted index 16 as valid. > > Fixes: 01fb4b822472 ("arm_mpam: Add the class and component structures for firmware described ris") > Signed-off-by: Yin Li > Reviewed-by: Andre Przywara > Reviewed-by: Ben Horgan > --- > drivers/resctrl/mpam_devices.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c > index 48adc49b833c..347a5a6d6a1d 100644 > --- a/drivers/resctrl/mpam_devices.c > +++ b/drivers/resctrl/mpam_devices.c > @@ -700,7 +700,7 @@ static int mpam_ris_create_locked(struct mpam_msc *msc, u8 ris_idx, > > lockdep_assert_held(&mpam_list_lock); > > - if (ris_idx > MPAM_MSC_MAX_NUM_RIS) > + if (ris_idx >= MPAM_MSC_MAX_NUM_RIS) > return -EINVAL; > > if (test_and_set_bit(ris_idx, &msc->ris_idxs)) > Best Regards, Srivathsa