linux-kernel - [PATCH AUTOSEL 4.19 48/56] tty: ipwireless: fix error handling

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Message-Id: <20201018192417.4055228-48-sashal@kernel.org>
Date:   Sun, 18 Oct 2020 15:24:09 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Tong Zhang <ztong0001@...il.com>, David Sterba <dsterba@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.19 48/56] tty: ipwireless: fix error handling

From: Tong Zhang <ztong0001@...il.com>

[ Upstream commit db332356222d9429731ab9395c89cca403828460 ]

ipwireless_send_packet() can only return 0 on success and -ENOMEM on
error, the caller should check non zero for error condition

Signed-off-by: Tong Zhang <ztong0001@...il.com>
Acked-by: David Sterba <dsterba@...e.com>
Link: https://lore.kernel.org/r/20200821161942.36589-1-ztong0001@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/tty/ipwireless/network.c | 4 ++--
 drivers/tty/ipwireless/tty.c     | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/ipwireless/network.c b/drivers/tty/ipwireless/network.c
index cf20616340a1a..fe569f6294a24 100644
--- a/drivers/tty/ipwireless/network.c
+++ b/drivers/tty/ipwireless/network.c
@@ -117,7 +117,7 @@ static int ipwireless_ppp_start_xmit(struct ppp_channel *ppp_channel,
 					       skb->len,
 					       notify_packet_sent,
 					       network);
-			if (ret == -1) {
+			if (ret < 0) {
 				skb_pull(skb, 2);
 				return 0;
 			}
@@ -134,7 +134,7 @@ static int ipwireless_ppp_start_xmit(struct ppp_channel *ppp_channel,
 					       notify_packet_sent,
 					       network);
 			kfree(buf);
-			if (ret == -1)
+			if (ret < 0)
 				return 0;
 		}
 		kfree_skb(skb);
diff --git a/drivers/tty/ipwireless/tty.c b/drivers/tty/ipwireless/tty.c
index 1ef751c27ac6d..cb04971843306 100644
--- a/drivers/tty/ipwireless/tty.c
+++ b/drivers/tty/ipwireless/tty.c
@@ -218,7 +218,7 @@ static int ipw_write(struct tty_struct *linux_tty,
 	ret = ipwireless_send_packet(tty->hardware, IPW_CHANNEL_RAS,
 			       buf, count,
 			       ipw_write_packet_sent_callback, tty);
-	if (ret == -1) {
+	if (ret < 0) {
 		mutex_unlock(&tty->ipw_tty_mutex);
 		return 0;
 	}
-- 
2.25.1