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Wed, 14 Oct 2026 20:49:25 -0700 (PDT) Received: from i4-gl-tmk5904-1.ad.psu.edu ([130.203.156.90]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-91b97b3864dsm70540626d6.14.2026.10.14.20.49.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Oct 2026 20:49:23 -0700 (PDT) From: Myeonghun Pak To: Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Ijae Kim , Vasileios Almpanis Subject: [PATCH 4/4] usb: gadget: pch_udc: free the EP0 data descriptor to its owning pool Date: Wed, 14 Oct 2026 23:49:16 -0400 Message-ID: <20261015034916.2773248-5-mhun512@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261015034916.2773248-1-mhun512@gmail.com> References: <20261015034916.2773248-1-mhun512@gmail.com> Content-Type: text/plain; charset="utf-8" Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The EP0 OUT data descriptor is allocated from data_requests, but cleanup destroys that pool before passing the descriptor to stp_requests. Return it to data_requests before destroying the owning pool. Keep the setup descriptor on stp_requests. This issue was identified as part of our ongoing research while reviewing kernel code. Fixes: f646cf94520e ("USB device driver of Topcliff PCH") Assisted-by: LLM Co-developed-by: Ijae Kim Signed-off-by: Ijae Kim Signed-off-by: Myeonghun Pak --- Compile-tested only. drivers/usb/gadget/udc/pch_udc.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/drivers/usb/gadget/udc/pch_udc.c b/drivers/usb/gadget/udc/pch_udc.c index 38b9159e2461..b07da0fdcdfc 100644 --- a/drivers/usb/gadget/udc/pch_udc.c +++ b/drivers/usb/gadget/udc/pch_udc.c @@ -2984,20 +2984,21 @@ static void pch_udc_cleanup(struct pch_udc_dev *dev) } /* dma pool cleanup */ - dma_pool_destroy(dev->data_requests); + if (dev->data_requests) { + if (dev->ep[UDC_EP0OUT_IDX].td_data) + dma_pool_free(dev->data_requests, + dev->ep[UDC_EP0OUT_IDX].td_data, + dev->ep[UDC_EP0OUT_IDX].td_data_phys); + dma_pool_destroy(dev->data_requests); + } if (dev->stp_requests) { - /* cleanup DMA desc's for ep0in */ + /* Free the EP0 OUT setup descriptor. */ if (dev->ep[UDC_EP0OUT_IDX].td_stp) { dma_pool_free(dev->stp_requests, dev->ep[UDC_EP0OUT_IDX].td_stp, dev->ep[UDC_EP0OUT_IDX].td_stp_phys); } - if (dev->ep[UDC_EP0OUT_IDX].td_data) { - dma_pool_free(dev->stp_requests, - dev->ep[UDC_EP0OUT_IDX].td_data, - dev->ep[UDC_EP0OUT_IDX].td_data_phys); - } dma_pool_destroy(dev->stp_requests); }