From: Ziyang Xuan <william.xuanziyang@huawei.com>
Date: Thu, 20 Apr 2023 20:40:35 +0800
Subject: [PATCH] ipv4: Fix potential uninit variable access bug in
__ip_make_skb()
References: bsc#1012628
Patch-mainline: 6.3.2
Git-commit: 99e5acae193e369b71217efe6f1dad42f3f18815
[ Upstream commit 99e5acae193e369b71217efe6f1dad42f3f18815 ]
Like commit ea30388baebc ("ipv6: Fix an uninit variable access bug in
__ip6_make_skb()"). icmphdr does not in skb linear region under the
scenario of SOCK_RAW socket. Access icmp_hdr(skb)->type directly will
trigger the uninit variable access bug.
Use a local variable icmp_type to carry the correct value in different
scenarios.
Fixes: 96793b482540 ("[IPV4]: Add ICMPMsgStats MIB (RFC 4293)")
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
net/ipv4/ip_output.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 4e4e308c..89bd7872 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1570,9 +1570,19 @@ struct sk_buff *__ip_make_skb(struct sock *sk,
cork->dst = NULL;
skb_dst_set(skb, &rt->dst);
- if (iph->protocol == IPPROTO_ICMP)
- icmp_out_count(net, ((struct icmphdr *)
- skb_transport_header(skb))->type);
+ if (iph->protocol == IPPROTO_ICMP) {
+ u8 icmp_type;
+
+ /* For such sockets, transhdrlen is zero when do ip_append_data(),
+ * so icmphdr does not in skb linear region and can not get icmp_type
+ * by icmp_hdr(skb)->type.
+ */
+ if (sk->sk_type == SOCK_RAW && !inet_sk(sk)->hdrincl)
+ icmp_type = fl4->fl4_icmp_type;
+ else
+ icmp_type = icmp_hdr(skb)->type;
+ icmp_out_count(net, icmp_type);
+ }
ip_cork_release(cork);
out:
--
2.35.3