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Sun, 13 Sep 2026 23:08:52 -0700 (PDT) From: Li Pengfei X-Google-Original-From: Li Pengfei To: sashiko-bot@kernel.org Cc: Pengfei Li , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Mark Rutland , Jonathan Corbet , Shuah Khan , kernel test robot , Bo Zhang , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: Re: [RFC PATCH v7 05/10] trace: make the stackmap capacity settable on the kernel command line Date: Mon, 14 Sep 2026 14:08:23 +0800 Message-Id: <20260914060824.4003131-1-lipengfei28@xiaomi.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260912085841.48E7B1F00893@smtp.kernel.org> References: <20260912083753.3426176-1-lipengfei28@xiaomi.com> <20260912083753.3426176-6-lipengfei28@xiaomi.com> <20260912085841.48E7B1F00893@smtp.kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Pengfei Li > Does passing this NULL pointer directly to kstrtoul() cause an immediate NULL > pointer dereference and kernel panic, since kstrtoul() does not check for a > NULL pointer before dereferencing it? Yes. Booting with a bare "ftrace_stackmap.bits" panics. Will fix in v8: if (!str) return -EINVAL; Thanks. Pengfei