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Subject: Re: [syzbot] [wireless?] KMSAN: uninit-value in cfg80211_classify8021d
Author: listout@listout.xyz
On 20.10.2025 14:07, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 98ac9cc4b445 Merge tag 'f2fs-fix-6.18-rc2' of git://git.ke..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=16be6734580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=bbd3e7f3c2e28265
> dashboard link: https://syzkaller.appspot.com/bug?extid=878ddc3962f792e9af59
> compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111e7dcd980000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1223a492580000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/f8ad8459a8da/disk-98ac9cc4.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/28720fa307c1/vmlinux-98ac9cc4.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/e4f310acec99/bzImage-98ac9cc4.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+878ddc3962f792e9af59@syzkaller.appspotmail.com
#syz test
diff --git a/net/wireless/util.c b/net/wireless/util.c
index 56724b33af04..b7290912dffb 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -938,9 +938,9 @@ EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
unsigned int cfg80211_classify8021d(struct sk_buff *skb,
struct cfg80211_qos_map *qos_map)
{
- unsigned int dscp;
- unsigned char vlan_priority;
- unsigned int ret;
+ unsigned int dscp = 0;
+ unsigned char vlan_priority = 0;
+ unsigned int ret = 0;
/* skb->priority values from 256->263 are magic values to
* directly indicate a specific 802.1d priority. This is used
--
Regards,
listout