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Thu, 05 Nov 2026 06:10:46 -0800 (PST) Received: from localhost ([2c0f:3d00:6be:8900:ce5e:9212:ea4b:f30]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4b56ef2e968sm82347785e9.8.2026.11.05.06.10.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Nov 2026 06:10:45 -0800 (PST) Date: Thu, 5 Nov 2026 17:10:41 +0300 From: Dan Carpenter To: oe-kbuild@lists.linux.dev, cros-kernel-buildreports@googlegroups.com Cc: lkp@intel.com, oe-kbuild-all@lists.linux.dev Subject: [android-common:android14-kiwi-6.1 390/390] kernel/trace/ring_buffer.c:2177 ring_buffer_resize() warn: variable dereferenced before check 'buffer' (see line 2172) Message-ID: X-Mailing-List: oe-kbuild@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline tree: https://android.googlesource.com/kernel/common android14-kiwi-6.1 head: 900d46d1c904d34d7c3eeb0ef2119cffc5a8ab3d commit: 5ecbcb61e172d82faf1bd8c00b17837d3c658c59 [390/390] ANDROID: ring-buffer: Introducing external writer support config: i386-randconfig-2200-20261105 (https://download.01.org/0day-ci/archive/20261105/202611051422.WODTXWDt-lkp@intel.com/config) compiler: clang version 22.1.8 (https://github.com/llvm/llvm-project ca7933e47d3a3451d81e72ac174dcb5aa28b59d1) smatch: v0.5.0-9187-g5189e3fb If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202611051422.WODTXWDt-lkp@intel.com/ smatch warnings: kernel/trace/ring_buffer.c:2177 ring_buffer_resize() warn: variable dereferenced before check 'buffer' (see line 2172) vim +/buffer +2177 kernel/trace/ring_buffer.c 13292494379f92 Steven Rostedt (VMware 2019-12-13 2165) int ring_buffer_resize(struct trace_buffer *buffer, unsigned long size, 438ced1720b584 Vaibhav Nagarnaik 2012-02-02 2166 int cpu_id) 7a8e76a3829f10 Steven Rostedt 2008-09-29 2167 { 7a8e76a3829f10 Steven Rostedt 2008-09-29 2168 struct ring_buffer_per_cpu *cpu_buffer; 9b94a8fba501f3 Steven Rostedt (Red Hat 2016-05-12 2169) unsigned long nr_pages; 0a1754b2a97efa Qiujun Huang 2020-10-19 2170 int cpu, err; 7a8e76a3829f10 Steven Rostedt 2008-09-29 2171 5ecbcb61e172d8 Vincent Donnefort 2022-08-24 @2172 if (unlikely(has_ext_writer(buffer))) ^^^^^^ Unchecked dereference 5ecbcb61e172d8 Vincent Donnefort 2022-08-24 2173 return -EINVAL; ee51a1de7e3837 Ingo Molnar 2008-11-13 2174 /* ee51a1de7e3837 Ingo Molnar 2008-11-13 2175 * Always succeed at resizing a non-existent buffer: ee51a1de7e3837 Ingo Molnar 2008-11-13 2176 */ ee51a1de7e3837 Ingo Molnar 2008-11-13 @2177 if (!buffer) ^^^^^^^ Checked too late. 0a1754b2a97efa Qiujun Huang 2020-10-19 2178 return 0; ee51a1de7e3837 Ingo Molnar 2008-11-13 2179 6a31e1f135d1ab Steven Rostedt 2012-05-23 2180 /* Make sure the requested buffer exists */ -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki