[syzbot] [net?] KASAN: slab-out-of-bounds Read in dns_resolver_preparse

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+94bbb75204a05da3d89f at syzkaller.appspotmail.com

Tested on:

commit:         3f82f1c3 Merge tag 'x86-urgent-2023-12-23' of git://gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=132be7e9e80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9f7c7b3fa354ead9
dashboard link: https://syzkaller.appspot.com/bug?extid=94bbb75204a05da3d89f
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=15ef6e26e80000

Note: testing is done by a robot and is best-effort only.