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Wed, 29 Oct 2025 22:18:14 -0700 (PDT) Received: from localhost.localdomain ([124.77.218.104]) by smtp.googlemail.com with ESMTPSA id d2e1a72fcca58-7a414066d0esm17445157b3a.43.2025.10.29.22.18.11 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Wed, 29 Oct 2025 22:18:14 -0700 (PDT) From: Miaoqian Lin To: Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Geliang Tang , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Cc: linmq006@gmail.com, stable@vger.kernel.org Subject: [PATCH] powerpc/pseries: add input size check in ofdt_write Date: Thu, 30 Oct 2025 13:17:55 +0800 Message-Id: <20251030051759.93014-1-linmq006@gmail.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) 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" A malicious user could pass an arbitrarily bad value to memdup_user_nul(), potentially causing kernel crash. This follows the same pattern as commit ee76746387f6 ("netdevsim: prevent bad user input in nsim_dev_health_break_write()") Found via static analysis and code review. Fixes: 3783225130f0 ("powerpc/pseries: use memdup_user_nul") Cc: stable@vger.kernel.org Signed-off-by: Miaoqian Lin --- arch/powerpc/platforms/pseries/reconfig.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/powerpc/platforms/pseries/reconfig.c b/arch/powerpc/platf= orms/pseries/reconfig.c index 599bd2c78514..b6bc1d8b2207 100644 --- a/arch/powerpc/platforms/pseries/reconfig.c +++ b/arch/powerpc/platforms/pseries/reconfig.c @@ -366,6 +366,9 @@ static ssize_t ofdt_write(struct file *file, const char= __user *buf, size_t coun if (rv) return rv; =20 + if (count =3D=3D 0 || count > PAGE_SIZE) + return -EINVAL; + kbuf =3D memdup_user_nul(buf, count); if (IS_ERR(kbuf)) return PTR_ERR(kbuf); --=20 2.39.5 (Apple Git-154)