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Mon, 17 Aug 2026 02:24:57 -0700 (PDT) From: Mohamad Raizudeen To: bhelgaas@google.com Cc: alex@shazbot.org, skhan@linuxfoundation.org, jkoolstra@xs4all.nl, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Mohamad Raizudeen Subject: [PATCH] PCI: quirks: Fix out-of-bounds MMIO read in nvme_disable_and_flr() Date: Mon, 17 Aug 2026 14:54:47 +0530 Message-ID: <20260817092448.4395-1-raizudeen.kerneldev@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In nvme_disable_and_flr(), the PCI bar is mapped using NVME_REG_CC + sizeof(cfg) which is (0x14 + 4 =3D 0x18 bytes) However, the function later reads the controller status from NVME_REG_CSTS - offset 0x1C, which is outside the mapped 0x18 byte boundary and it can cause a page fault or kernel panic on architectures that enforce strict MMIO boundaries. Fix this by increasing the mapping size to include NVME_REG_CSTS. Fixes: ffb0863426eb9 ("PCI: Disable Samsung SM961/PM961 NVMe before FLR") Signed-off-by: Mohamad Raizudeen --- drivers/pci/quirks.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index b09f27f7846f..ed03892cc960 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -4090,7 +4090,7 @@ static int nvme_disable_and_flr(struct pci_dev *dev, = bool probe) if (probe) return 0; =20 - bar =3D pci_iomap(dev, 0, NVME_REG_CC + sizeof(cfg)); + bar =3D pci_iomap(dev, 0, NVME_REG_CSTS + sizeof(cfg)); if (!bar) return -ENOTTY; =20 --=20 2.53.0