From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752511AbcBYXKG (ORCPT ); Thu, 25 Feb 2016 18:10:06 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:41083 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751896AbcBYXKE (ORCPT ); Thu, 25 Feb 2016 18:10:04 -0500 From: Colin King To: Jakub Kicinski , Kalle Valo , Matthias Brugger , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Cc: linux-kernel@vger.kernel.org Subject: [PATCH][V2] mt7601u: do not free dma_buf when ivp allocation fails Date: Thu, 25 Feb 2016 23:09:59 +0000 Message-Id: <1456441799-19266-1-git-send-email-colin.king@canonical.com> X-Mailer: git-send-email 2.7.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Colin Ian King If the allocation of ivp fails the error handling attempts to free an uninitialized dma_buf; this data structure just contains garbage on the stack, so the freeing will cause issues when the urb, buf and dma fields are free'd. Fix this by not free'ing the dma_buf if the ivp allocation fails. Signed-off-by: Colin Ian King --- drivers/net/wireless/mediatek/mt7601u/mcu.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt7601u/mcu.c b/drivers/net/wireless/mediatek/mt7601u/mcu.c index fbb1986..70e4b5e 100644 --- a/drivers/net/wireless/mediatek/mt7601u/mcu.c +++ b/drivers/net/wireless/mediatek/mt7601u/mcu.c @@ -362,10 +362,10 @@ mt7601u_upload_firmware(struct mt7601u_dev *dev, const struct mt76_fw *fw) int i, ret; ivb = kmemdup(fw->ivb, sizeof(fw->ivb), GFP_KERNEL); - if (!ivb || mt7601u_usb_alloc_buf(dev, MCU_FW_URB_SIZE, &dma_buf)) { - ret = -ENOMEM; + if (!ivb) + return -ENOMEM; + if (mt7601u_usb_alloc_buf(dev, MCU_FW_URB_SIZE, &dma_buf)) goto error; - } ilm_len = le32_to_cpu(fw->hdr.ilm_len) - sizeof(fw->ivb); dev_dbg(dev->dev, "loading FW - ILM %u + IVB %zu\n", -- 2.7.0