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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2eae6c37551sm21207715ad.51.2026.10.28.04.47.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Oct 2026 04:47:54 -0700 (PDT) From: Yin Li Date: Wed, 28 Oct 2026 19:45:42 +0800 Subject: [PATCH v4 2/6] arm_mpam: Fix MSC MMIO window size off-by-one with resource_size() 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 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261028-mpam-resctrl-dt-knp-support-v4-2-bdda1e445cba@oss.qualcomm.com> References: <20261028-mpam-resctrl-dt-knp-support-v4-0-bdda1e445cba@oss.qualcomm.com> In-Reply-To: <20261028-mpam-resctrl-dt-knp-support-v4-0-bdda1e445cba@oss.qualcomm.com> To: James Morse , Rob Herring , Shanker Donthineni , Ben Horgan , Krzysztof Kozlowski , Conor Dooley , Catalin Marinas , Greg Kroah-Hartman , "Rafael J. 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With the size one byte too small, an access to the last register in the window is incorrectly flagged as out of bounds: for a 0x1000 window, a 4-byte access at offset 0xFFC (bytes 0xFFC..0xFFF, legal) computes 0xFFC + 4 = 0x1000 > 0xFFF and falsely warns. Use resource_size() so the size is correct. The ">" bounds checks are correct as-is once the size is accurate and are left unchanged. Fixes: f04046f2577a ("arm_mpam: Add probe/remove for mpam msc driver and kbuild boiler plate") Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202609030809.ObirDhR3-lkp@intel.com/ 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 347a5a6d6a1d..0f984fcbcae9 100644 --- a/drivers/resctrl/mpam_devices.c +++ b/drivers/resctrl/mpam_devices.c @@ -2508,7 +2508,7 @@ static struct mpam_msc *do_mpam_msc_drv_probe(struct platform_device *pdev) dev_err_once(dev, "Failed to map MSC base address\n"); return ERR_CAST(io); } - msc->mapped_hwpage_sz = msc_res->end - msc_res->start; + msc->mapped_hwpage_sz = resource_size(msc_res); msc->mapped_hwpage = io; } else if (msc->iface == MPAM_IFACE_PCC) { u32 mpam_fb_msc_id; -- 2.34.1