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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2d315f4819dsm8360885ad.37.2026.08.11.06.36.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 Aug 2026 06:37:00 -0700 (PDT) From: Yin Li Date: Tue, 11 Aug 2026 21:30:36 +0800 Subject: [PATCH RFC 07/15] 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: <20260811-mpam-resctrl-dt-knp-support-v1-7-ea6397bead59@oss.qualcomm.com> References: <20260811-mpam-resctrl-dt-knp-support-v1-0-ea6397bead59@oss.qualcomm.com> In-Reply-To: <20260811-mpam-resctrl-dt-knp-support-v1-0-ea6397bead59@oss.qualcomm.com> To: "Rafael J. Wysocki" , Shanker Donthineni , Conor Dooley , Fenghua Yu , Krzysztof Kozlowski , Rob Herring , Reinette Chatre , Konrad Dybcio , James Morse , Ben Horgan , Bjorn Andersson , Danilo Krummrich , Greg Kroah-Hartman Cc: linux-arm-msm@vger.kernel.org, ganapatrao.kulkarni@oss.qualcomm.com, trilok.soni@oss.qualcomm.com, devicetree@vger.kernel.org, driver-core@lists.linux.dev, Srivathsa L Rao , Huang Yiwei , aiqun.yu@oss.qualcomm.com, linux-kernel@vger.kernel.org X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1786455323; l=929; i=yin.li@oss.qualcomm.com; s=20260811; h=from:subject:message-id; bh=nk0+lqmwemEwOq/+VNFwqihY6Bh4+dlMQ4KcgiZ0hnE=; b=s84p4P01mgVVR1o4H7MeEiKLbGr93oPLw4xXM6u0g3VS553DL2JR22LNajgYTtWXmfoJpDtj5 xOTAS8ZQOGyD7Jsl8Seq3hYMSptmsxxLVB2XtBcIikPS2DCj/3HFOD0 X-Developer-Key: i=yin.li@oss.qualcomm.com; a=ed25519; pk=e/2LM97aSWGBMrxY240URBi9Zi8/kL5hXgB+VHkYvW0= X-Proofpoint-GUID: 2o_zINB8ZIOQyz75emNRCyjxl04cPkgy X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODExMDExNCBTYWx0ZWRfX/D8wjnLODjdn 3mz3rcXc8QbAGgd5OAvnoRzw0dcm1nf7asfpPwzFG1VRTcwRgQ0tDQENbv9mqo7iEqKxpaXrcG1 CEFmoVRwpi9brZGLC2YuTRdZcp4VGr/hVwUQVaFhF2NFIXNFIDHQX8JDjrW7IYH8qcjWYPJ3tb4 lRCdUA0GGjIzMQ0a/7eSrRqRunBK3n/CXZfN7iuKXnNiK0CBlRkO2YdZY7/4nex28ND5A5+pKaI N+6vtsR3iSO0GGafne/xANjaI2X6D/LCBgnHU70nNOajp1lUIiIvfbsB9BKWU61XdaOkDi2e2m4 1jQZm7sgvGMkOYdKSU3sE6rBx+JwLArA5OpxR3XeWMSTx6zdo3UIWryJfG2s7hEww/OzU01gG7d TLY0elCoD25Fl18J9OHhdYnIBKNkirpMNMGBWrrZb2biiQAQaI73fMqjncUlXQolBcZDvzHYk+Y U5zZwMsa48yS+WGZqvw== X-Proofpoint-Spam-Info: AW1haW4tMjYwODExMDExNCBTYWx0ZWRfX1OuEhT7P4Ugn b5nXz6dZZ57WzuA78V7rL2tjGnQxDGHEStNkF61EP8tvJqXMNmsDIfbS+umfPsQ8e6eZk7zEm9e jW9lv2t+ONRthgPB/g7U1yemUa+pw+k= X-Proofpoint-ORIG-GUID: 2o_zINB8ZIOQyz75emNRCyjxl04cPkgy X-Authority-Analysis: v=2.4 cv=brt8wkai c=1 sm=1 tr=0 ts=6a7b257e cx=c_pps a=JL+w9abYAAE89/QcEU+0QA==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=EUspDBNiAAAA:8 a=tscwNbPNHAv0RIyyFlgA:9 a=QEXdDO2ut3YA:10 a=324X-CrmTo6CU4MGRt3R: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=2026-08-11_03,2026-08-10_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 malwarescore=0 adultscore=0 clxscore=1015 suspectscore=0 impostorscore=0 spamscore=0 lowpriorityscore=0 priorityscore=1501 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608110114 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. Signed-off-by: Yin Li --- 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 ddc15249ec1e..cc9fa1d78925 100644 --- a/drivers/resctrl/mpam_devices.c +++ b/drivers/resctrl/mpam_devices.c @@ -725,7 +725,7 @@ 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