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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-39d98e60484sm19488728a91.4.2026.09.14.02.39.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Sep 2026 02:39:44 -0700 (PDT) From: Yin Li Date: Mon, 14 Sep 2026 17:37:49 +0800 Subject: [PATCH RFC v2 01/10] arm_mpam: Fix the RIS index range check in mpam_ris_create_locked Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260914-mpam-resctrl-dt-knp-support-v2-1-bf6645bb2f65@oss.qualcomm.com> References: <20260914-mpam-resctrl-dt-knp-support-v2-0-bf6645bb2f65@oss.qualcomm.com> In-Reply-To: <20260914-mpam-resctrl-dt-knp-support-v2-0-bf6645bb2f65@oss.qualcomm.com> To: 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: Yin Li , 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, Srivathsa L Rao , 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 X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1789378758; l=1084; i=yin.li@oss.qualcomm.com; s=20260811; h=from:subject:message-id; bh=Jy14sVbtBOA4INaXpzyNkK/bT7ygjH1r3zg1u0X4N9o=; b=8qVts8kvOfruxq59KFcdjO9xhhSgezIyTV0q1/20EcQF+DfUllQOZoPY0Owrd4E15wWT9eUt0 Aa/3hS1ds/7BuqTY+P0ocnYLZ9q7OxXK12q95t3cvNkvuz4MnkRAN+f X-Developer-Key: i=yin.li@oss.qualcomm.com; a=ed25519; pk=e/2LM97aSWGBMrxY240URBi9Zi8/kL5hXgB+VHkYvW0= X-Proofpoint-GUID: BB2zBUN4huNI2CT0GbFb6ngQgKP3wgJv X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTE0MDEzNyBTYWx0ZWRfX7fL004oaNUP5 1S7t/ptYKmq1dXeHMFA1+COupTMKMyX2+5q+9s705zhHNKZHkaICiizSaD1SsdNUGYMxv8RJoyC 84nd9DBDnR3B+I4sEVfIHIBmTuFq3NOhZ8TelJKJFcPRLQkrQW8tIkf840iMIrhTLxov4D2CQYB abzEXkR8IhtL502IwIzf5d7nd72QsH6mTjuGbn5KPiYd8i2EOaTfd6Ad53arbxGhcC+XWgCrec3 B4gNbiYX8h7itLxOWLtQeaRzQ6OhZz46C95jDs9/ckyZEU993inHs8O2+Qv05QfT2nKocu8HRCA HngE52s2iCekj+rgtvBE/Uj3Qmj84yEkVYNWZ/ioHQWqVXDoqLQIoV2NQWGWEsoFmhb1KMFjSZT 5rqXaciwAmlLnN34NzMGhX+EK/2KDqZlWb39DuKYZUpIP51TG4SGDHB6pE265RvriOz6F6JnchM hI77bShaq5jRPG2IF8g== X-Proofpoint-Spam-Info: AW1haW4tMjYwOTE0MDEzNyBTYWx0ZWRfX4Wjrvl7ckOhl mnSxGXINv7H9PwE7v7opptKsA2uKxU1ZdulglXbOIvlfaAFMDmhc/s/jYQRFFusY+UT2hPcBsTs /TzGucBtiDHs3dSJ4IQbIUSuskAQWiA= X-Proofpoint-ORIG-GUID: BB2zBUN4huNI2CT0GbFb6ngQgKP3wgJv X-Authority-Analysis: v=2.4 cv=PsUG/AM3 c=1 sm=1 tr=0 ts=6aa7c0e2 cx=c_pps a=cmESyDAEBpBGqyK7t0alAg==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=DJpcGTmdVt4CTyJn9g5Z:22 a=EUspDBNiAAAA:8 a=7CQSdrXTAAAA:8 a=cxiLKowE09Ysm4E8lmYA:9 a=QEXdDO2ut3YA:10 a=1OuFwYUASf3TG4hYMiVC:22 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-14_02,2026-09-13_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 priorityscore=1501 suspectscore=0 bulkscore=0 spamscore=0 malwarescore=0 lowpriorityscore=0 phishscore=0 adultscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609140137 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 --- 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 dd422c56fbb1..6da217abf689 100644 --- a/drivers/resctrl/mpam_devices.c +++ b/drivers/resctrl/mpam_devices.c @@ -552,7 +552,7 @@ 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)) -- 2.34.1