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Thu, 15 Oct 2026 01:03:55 -0700 (PDT) Received: from localhost ([2c0f:3d00:6be:8900:ce5e:9212:ea4b:f30]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48de0ac35dfsm17171447f8f.33.2026.10.15.01.03.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 Oct 2026 01:03:54 -0700 (PDT) Date: Fri, 2 Oct 2026 19:23:21 +0300 From: Dan Carpenter To: linux-media@vger.kernel.org Subject: [bug report] [media] cx231xx: Added support for Carraera, Shelby, RDx_253S and VIDEO_GRABBER Message-ID: Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hello Media Developers, Commit 64fbf4445526 ("[media] cx231xx: Added support for Carraera, Shelby, RDx_253S and VIDEO_GRABBER") from Jul 6, 2010 (linux-next), leads to the following Smatch static checker warning: drivers/media/usb/cx231xx/cx231xx-417.c:1354 cx231xx_bulk_copy() warn: buffer 'buffer' too small user_len=0-u32max for 3 byte copy drivers/media/usb/cx231xx/cx231xx-417.c 1341 static int cx231xx_bulk_copy(struct cx231xx *dev, struct urb *urb) 1342 { 1343 struct cx231xx_dmaqueue *dma_q = urb->context; 1344 unsigned char *p_buffer, *buffer; 1345 u32 buffer_size = 0; 1346 1347 p_buffer = urb->transfer_buffer; 1348 buffer_size = urb->actual_length; Smatch and ChatGPT want an: if (buffer_size < 3) return -ESOMETHING; 1349 1350 buffer = kmalloc(buffer_size, GFP_ATOMIC); 1351 if (!buffer) 1352 return -ENOMEM; 1353 --> 1354 memcpy(buffer, dma_q->ps_head, 3); Otherwise it leads to a crash. 1355 memcpy(buffer+3, p_buffer, buffer_size-3); 1356 memcpy(dma_q->ps_head, p_buffer+buffer_size-3, 3); 1357 1358 p_buffer = buffer; 1359 buffer_filled(p_buffer, buffer_size, urb, dma_q); 1360 1361 kfree(buffer); 1362 return 0; 1363 } This email is a free service from the Smatch-CI project [smatch.sf.net]. regards, dan carpenter