netdev - [PATCH] net/ieee802154: fix uninit value bug in dgram

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220822071902.3419042-1-tcs_kernel@tencent.com>
Date:   Mon, 22 Aug 2022 15:19:02 +0800
From:   Haimin Zhang <tcs.kernel@...il.com>
To:     alex.aring@...il.com, stefan@...enfreihafen.org,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, linux-wpan@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Haimin Zhang <tcs_kernel@...cent.com>
Subject: [PATCH] net/ieee802154: fix uninit value bug in dgram_sendmsg

There is uninit value bug in dgram_sendmsg function in
net/ieee802154/socket.c when the length of valid data pointed by the
msg->msg_name isn't verified.

This length is specified by msg->msg_namelen. Function
ieee802154_addr_from_sa is called by dgram_sendmsg, which use
msg->msg_name as struct sockaddr_ieee802154* and read it, that will
eventually lead to uninit value read. So we should check the length of
msg->msg_name is not less than sizeof(struct sockaddr_ieee802154)
before entering the ieee802154_addr_from_sa.

Signed-off-by: Haimin Zhang <tcs_kernel@...cent.com>
---
 net/ieee802154/socket.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/ieee802154/socket.c b/net/ieee802154/socket.c
index 718fb77bb..efbe08590 100644
--- a/net/ieee802154/socket.c
+++ b/net/ieee802154/socket.c
@@ -655,6 +655,10 @@ static int dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 	if (msg->msg_name) {
 		DECLARE_SOCKADDR(struct sockaddr_ieee802154*,
 				 daddr, msg->msg_name);
+		if (msg->msg_namelen < sizeof(*daddr)) {
+			err = -EINVAL;
+			goto out_skb;
+		}

 		ieee802154_addr_from_sa(&dst_addr, &daddr->addr);
 	} else {
-- 
2.27.0