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Mon, 30 Mar 2026 07:37:58 -0700 (PDT) Date: Mon, 30 Mar 2026 17:37:55 +0300 From: Dan Carpenter To: Nuno =?iso-8859-1?Q?S=E1?= Cc: kernel test robot , oe-kbuild@lists.linux.dev Subject: Re: [PATCH v2 3/4] dmaengine: dma-axi-dmac: fix use-after-free on unbind Message-ID: References: <202603300705.jhDfInJk-lkp@intel.com> Precedence: bulk X-Mailing-List: oe-kbuild@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Mon, Mar 30, 2026 at 03:32:25PM +0100, Nuno Sá wrote: > On Mon, Mar 30, 2026 at 07:40:55AM +0800, kernel test robot wrote: > > BCC: lkp@intel.com > > CC: oe-kbuild-all@lists.linux.dev > > In-Reply-To: <20260327-dma-dmac-handle-vunmap-v2-3-021f95f0e87b@analog.com> > > References: <20260327-dma-dmac-handle-vunmap-v2-3-021f95f0e87b@analog.com> > > TO: "Nuno Sá via B4 Relay" > > TO: dmaengine@vger.kernel.org > > TO: linux-kernel@vger.kernel.org > > CC: "Lars-Peter Clausen" > > CC: Vinod Koul > > CC: Frank Li > > > > Hi Nuno, > > > > kernel test robot noticed the following build warnings: > > > > [auto build test WARNING on b7560798466a07d9c3fb011698e92c335ab28baf] > > > > url: https://github.com/intel-lab-lkp/linux/commits/Nuno-S-via-B4-Relay/dmaengine-Fix-possuible-use-after-free/20260329-160000 > > base: b7560798466a07d9c3fb011698e92c335ab28baf > > patch link: https://lore.kernel.org/r/20260327-dma-dmac-handle-vunmap-v2-3-021f95f0e87b%40analog.com > > patch subject: [PATCH v2 3/4] dmaengine: dma-axi-dmac: fix use-after-free on unbind > > :::::: branch date: 16 hours ago > > :::::: commit date: 16 hours ago > > config: loongarch-randconfig-r071-20260329 (https://download.01.org/0day-ci/archive/20260330/202603300705.jhDfInJk-lkp@intel.com/config) > > compiler: loongarch64-linux-gcc (GCC) 15.2.0 > > smatch: v0.5.0-9004-gb810ac53 > > > > 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/202603300705.jhDfInJk-lkp@intel.com/ > > > > smatch warnings: > > drivers/dma/dma-axi-dmac.c:1342 axi_dmac_probe() warn: address of NULL pointer 'dmac' > > Am I missing something or is this a false positive? > It is a false positive, yes. You're using lei to see unfiltered results. Normally I review the warnings and hit resend on the warnings which might be real. regards, dan carpenter