From nobody Mon Sep 16 19:03:49 2024 Received: from cstnet.cn (smtp84.cstnet.cn [159.226.251.84]) (using TLSv1.2 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AB52D15358A; Tue, 23 Jul 2024 14:04:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.84 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721743499; cv=none; b=JVTcxxwFVUGg0pcFbLG0K0MzX57UpaBv9zzZXFg9CLEuPLovy4FwkfQcyvwsLM9rjkM/8iMgF9RvcQQqf2PLGDUi0racGZcPqsHmC2dvyrTX+Njo8DpBk41xjpB99Mq9Dbf92PNEJTK19mDnfP7bRYtESo128FkOR05K/NlPXAQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721743499; c=relaxed/simple; bh=gpoIKz3CyyNATjADGveNp10VzH6Ry1z8FkbegxIvs8s=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=noQ2r5CkZL9ZyUHTlgjJTq0j1chYVwgalJU7mj4jcKnR6+uikfGNzaGRNrZYVY7lthOnw+FPhmESguTUc/sHs0MOAurMVThdMTPQ3gu06MBO0WwyHzdOM3+BuIt4HtlY/Anj8r6LH8M6cdZPTlW1ucoFpMNDPQRPw21IsPEhz2g= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn; spf=pass smtp.mailfrom=iscas.ac.cn; arc=none smtp.client-ip=159.226.251.84 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iscas.ac.cn Received: from icess-ProLiant-DL380-Gen10.. (unknown [183.174.60.14]) by APP-05 (Coremail) with SMTP id zQCowABXPjl0uJ9mLTORAA--.33853S2; Tue, 23 Jul 2024 22:04:43 +0800 (CST) From: Ma Ke To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, make24@iscas.ac.cn, liujunliang_ljl@163.com Cc: linux-usb@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] USB2NET: SR9700: fix uninitialized variable use in sr_mdio_read Date: Tue, 23 Jul 2024 22:04:34 +0800 Message-Id: <20240723140434.1330255-1-make24@iscas.ac.cn> X-Mailer: git-send-email 2.25.1 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-CM-TRANSID: zQCowABXPjl0uJ9mLTORAA--.33853S2 X-Coremail-Antispam: 1UD129KBjvJXoW7CF15XFyrCr4kZr4DuF45Jrb_yoW8Jw1xpr 4fWa9YyrWUJa42v3ykX3ykW3WF9ws5WFy3Gay8Ww4fZrZ5JFn5C34FgFyUWw1UGrW5Aa4a va1qyFW3Wa1FvaUanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUvK14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26r1j6r1xM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4j 6F4UM28EF7xvwVC2z280aVAFwI0_Cr1j6rxdM28EF7xvwVC2z280aVCY1x0267AKxVW0oV Cq3wAac4AC62xK8xCEY4vEwIxC4wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC 0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr 1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IE rcIFxwCY1x0262kKe7AKxVWUtVW8ZwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbV WUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF 67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42 IY6xIIjxv20xvEc7CjxVAFwI0_Jr0_Gr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF 0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxh VjvjDU0xZFpf9x0JUQvtAUUUUU= X-CM-SenderInfo: ppdnvj2u6l2u1dvotugofq/ Content-Type: text/plain; charset="utf-8" It could lead to error happen because the variable res is not updated if the call to sr_share_read_word returns an error. In this particular case error code was returned and res stayed uninitialized. This can be avoided by checking the return value of sr_share_read_word and propagating the error if the read operation failed. Fixes: c9b37458e956 ("USB2NET : SR9700 : One chip USB 1.1 USB2NET SR9700Dev= ice Driver Support") Signed-off-by: Ma Ke --- drivers/net/usb/sr9700.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/net/usb/sr9700.c b/drivers/net/usb/sr9700.c index 0a662e42ed96..d5bc596f4521 100644 --- a/drivers/net/usb/sr9700.c +++ b/drivers/net/usb/sr9700.c @@ -179,6 +179,7 @@ static int sr_mdio_read(struct net_device *netdev, int = phy_id, int loc) struct usbnet *dev =3D netdev_priv(netdev); __le16 res; int rc =3D 0; + int err; =20 if (phy_id) { netdev_dbg(netdev, "Only internal phy supported\n"); @@ -193,7 +194,10 @@ static int sr_mdio_read(struct net_device *netdev, int= phy_id, int loc) if (value & NSR_LINKST) rc =3D 1; } - sr_share_read_word(dev, 1, loc, &res); + err =3D sr_share_read_word(dev, 1, loc, &res); + if (err < 0) + return err; + if (rc =3D=3D 1) res =3D le16_to_cpu(res) | BMSR_LSTATUS; else --=20 2.25.1