linux-kernel - Forwarded: Re: test KMSAN: uninit-value in cfg80211

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Message-ID: <6914871d.050a0220.3565dc.0000.GAE@google.com>
Date: Wed, 12 Nov 2025 05:09:49 -0800
From: syzbot <syzbot+878ddc3962f792e9af59@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Forwarded: Re: test KMSAN: uninit-value in cfg80211_classify8021d

For archival purposes, forwarding an incoming command email to
linux-kernel@...r.kernel.org.

***

Subject: Re: test KMSAN: uninit-value in cfg80211_classify8021d
Author: vnranganath.20@...il.com

#syz test

diff --git a/net/wireless/util.c b/net/wireless/util.c
index 23bca5e687c1..c310876c6c72 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -963,13 +963,23 @@ unsigned int cfg80211_classify8021d(struct sk_buff *skb,

        switch (skb->protocol) {
        case htons(ETH_P_IP):
-               if (!pskb_may_pull(skb, sizeof(struct iphdr)))
+               struct iphdr iph, *ip;
+
+               ip = skb_header_pointer(skb, sizeof(struct ethhdr),
+                                       sizeof(*ip), &iph);
+               if (!ip)
                        return 0;
+
                dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
                break;
        case htons(ETH_P_IPV6):
-               if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+               struct ip6hdr ip6h, *ip6;
+
+               ip6 = skb_header_pointer(skb, sizeof(struct ethhdr),
+                                       sizeof(*ip6), &ip6h);
+               if (!ip6)
                        return 0;
+
                dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
                break;
        case htons(ETH_P_MPLS_UC):

On Wed, Nov 12, 2025 at 12:48 AM Ranganath V N <vnranganath.20@...il.com> wrote:
>
> #syz test