From nobody Tue Nov 26 11:49:48 2024 Received: from mail-out.aladdin-rd.ru (mail-out.aladdin-rd.ru [91.199.251.16]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D53E320127B; Fri, 18 Oct 2024 10:32:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.199.251.16 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729247578; cv=none; b=ePd1xm/qu+jUiWiDqnLO40hiLuofz7zo+XKx3atZm9W/AwGuv162HFnjsvgzxXx+GwozDzwq94/hE6WFJB0P89p1Ntj6voe6h3+fwZli2xOz57jpxKMmW/w+q8v2elabv2eF52GiJgsLQtwvBneY6hZvB9WYOv3bcorlja6su6o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729247578; c=relaxed/simple; bh=3mz4MUIU0xE0dIGnAS6LgmmKdoQPtlgIXHC/oaFPm/s=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=PQSygmWeKZS0oe5gcAjdgbC8PjrlykXIg6aLabsvv3OkAxjptd3oHfLqK11clraFzy93wLjPcUoWumbOqbBiyDgK241GzIIww1ITNYhrD1PPzZ69VvIM4hOhBZUNTDsMnYubyd6TrzyVCOkuBpb5cmtGZR0Spk9tu2uvaQ/0eVc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=aladdin.ru; spf=pass smtp.mailfrom=aladdin.ru; arc=none smtp.client-ip=91.199.251.16 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=aladdin.ru Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=aladdin.ru From: Daniil Dulov To: , Greg Kroah-Hartman CC: Daniil Dulov , Jes Sorensen , Kalle Valo , "David S. Miller" , Jakub Kicinski , , , , , Zheyu Ma , Kalle Valo Subject: [PATCH 5.10 1/1] wifi: rtl8xxxu: Fix the error handling of the probe function Date: Fri, 18 Oct 2024 13:32:30 +0300 Message-ID: <20241018103230.437496-2-d.dulov@aladdin.ru> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20241018103230.437496-1-d.dulov@aladdin.ru> References: <20241018103230.437496-1-d.dulov@aladdin.ru> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: EXCH-2016-04.aladdin.ru (192.168.1.104) To EXCH-2016-02.aladdin.ru (192.168.1.102) Content-Type: text/plain; charset="utf-8" From: Zheyu Ma commit 13876f2a087ad352bf640a7a0a4a4229ea6e9e4f upstream. When the driver fails at ieee80211_alloc_hw() at the probe time, the driver will free the 'hw' which is not allocated, causing a bug. The following log can reveal it: [ 15.981294] BUG: KASAN: user-memory-access in mutex_is_locked+0xe/0x40 [ 15.981558] Read of size 8 at addr 0000000000001ab0 by task modprobe/373 [ 15.982583] Call Trace: [ 15.984282] ieee80211_free_hw+0x22/0x390 [ 15.984446] rtl8xxxu_probe+0x3a1/0xab30 [rtl8xxxu] Fix the bug by changing the order of the error handling. Signed-off-by: Zheyu Ma Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20220716130444.2950690-1-zheyuma97@gmail.com Signed-off-by: Daniil Dulov --- .../wireless/realtek/rtl8xxxu/rtl8xxxu_core.c | 21 ++++++++++--------- 1 file changed, 11 insertions(+), 10 deletions(-) diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/driver= s/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c index 5b27c22e7e58..f26b515764b0 100644 --- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c +++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c @@ -6641,7 +6641,7 @@ static int rtl8xxxu_probe(struct usb_interface *inter= face, if (!hw) { ret =3D -ENOMEM; priv =3D NULL; - goto exit; + goto err_put_dev; } =20 priv =3D hw->priv; @@ -6664,24 +6664,24 @@ static int rtl8xxxu_probe(struct usb_interface *int= erface, =20 ret =3D rtl8xxxu_parse_usb(priv, interface); if (ret) - goto exit; + goto err_set_intfdata; =20 ret =3D rtl8xxxu_identify_chip(priv); if (ret) { dev_err(&udev->dev, "Fatal - failed to identify chip\n"); - goto exit; + goto err_set_intfdata; } =20 ret =3D rtl8xxxu_read_efuse(priv); if (ret) { dev_err(&udev->dev, "Fatal - failed to read EFuse\n"); - goto exit; + goto err_set_intfdata; } =20 ret =3D priv->fops->parse_efuse(priv); if (ret) { dev_err(&udev->dev, "Fatal - failed to parse EFuse\n"); - goto exit; + goto err_set_intfdata; } =20 rtl8xxxu_print_chipinfo(priv); @@ -6689,12 +6689,12 @@ static int rtl8xxxu_probe(struct usb_interface *int= erface, ret =3D priv->fops->load_firmware(priv); if (ret) { dev_err(&udev->dev, "Fatal - failed to load firmware\n"); - goto exit; + goto err_set_intfdata; } =20 ret =3D rtl8xxxu_init_device(hw); if (ret) - goto exit; + goto err_set_intfdata; =20 hw->wiphy->max_scan_ssids =3D 1; hw->wiphy->max_scan_ie_len =3D IEEE80211_MAX_DATA_LEN; @@ -6744,12 +6744,12 @@ static int rtl8xxxu_probe(struct usb_interface *int= erface, if (ret) { dev_err(&udev->dev, "%s: Failed to register: %i\n", __func__, ret); - goto exit; + goto err_set_intfdata; } =20 return 0; =20 -exit: +err_set_intfdata: usb_set_intfdata(interface, NULL); =20 if (priv) { @@ -6757,9 +6757,10 @@ static int rtl8xxxu_probe(struct usb_interface *inte= rface, mutex_destroy(&priv->usb_buf_mutex); mutex_destroy(&priv->h2c_mutex); } - usb_put_dev(udev); =20 ieee80211_free_hw(hw); +err_put_dev: + usb_put_dev(udev); =20 return ret; } --=20 2.25.1