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SubjectRe: BUG: unable to handle kernel NULL pointer dereference in cfg80211_wext_siwfrag
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syzbot has bisected this bug to:

commit c7cdba31ed8b87526db978976392802d3f93110c
Author: Cody Schuffelen <schuffelen@google.com>
Date: Wed Nov 21 03:14:49 2018 +0000

mac80211-next: rtnetlink wifi simulation device

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11cf6885e00000
start commit: d89091a4 macb: Don't unregister clks unconditionally
git tree: net
final crash: https://syzkaller.appspot.com/x/report.txt?x=13cf6885e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=15cf6885e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=f2f3ef188b7e16cf
dashboard link: https://syzkaller.appspot.com/bug?extid=e8a797964a4180eb57d5
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15c85915e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11c02bc1e00000

Reported-by: syzbot+e8a797964a4180eb57d5@syzkaller.appspotmail.com
Fixes: c7cdba31ed8b ("mac80211-next: rtnetlink wifi simulation device")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

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