linux-kernel - [PATCH] net: ieee802154: fix error return code of dgram

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Date:   Mon,  8 Mar 2021 01:31:06 -0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     alex.aring@...il.com, stefan@...enfreihafen.org,
        davem@...emloft.net, kuba@...nel.org
Cc:     linux-wpan@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH] net: ieee802154: fix error return code of dgram_sendmsg()

When sock_alloc_send_skb() returns NULL to skb, no error return code of
dgram_sendmsg() is assigned.
To fix this bug, err is assigned with -ENOMEM in this case.

Fixes: 78f821b64826 ("ieee802154: socket: put handling into one file")
Reported-by: TOTE Robot <oslab@...nghua.edu.cn>
Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
---
 net/ieee802154/socket.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/ieee802154/socket.c b/net/ieee802154/socket.c
index a45a0401adc5..a750b37c7e73 100644
--- a/net/ieee802154/socket.c
+++ b/net/ieee802154/socket.c
@@ -642,8 +642,10 @@ static int dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 	skb = sock_alloc_send_skb(sk, hlen + tlen + size,
 				  msg->msg_flags & MSG_DONTWAIT,
 				  &err);
-	if (!skb)
+	if (!skb) {
+		err = -ENOMEM;
 		goto out_dev;
+	}
 
 	skb_reserve(skb, hlen);
 
-- 
2.17.1