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SubjectRe: KASAN: use-after-free Read in _decode_session6
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syzbot suspects this bug was fixed by commit:

commit e7c87bd6cc4ec7b0ac1ed0a88a58f8206c577488
Author: Willem de Bruijn <willemb@google.com>
Date: Wed Jan 16 01:19:22 2019 +0000

bpf: in __bpf_redirect_no_mac pull mac only if present

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1736f974600000
start commit: b36fdc68 Merge tag 'gpio-v4.19-2' of git://git.kernel.org/..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=4c7e83258d6e0156
dashboard link: https://syzkaller.appspot.com/bug?extid=e8c1d30881266e47eb33
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14d42021400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13d09f1e400000

If the result looks correct, please mark the bug fixed by replying with:

#syz fix: bpf: in __bpf_redirect_no_mac pull mac only if present

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

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