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H A D | tun.c | diff c7256f579f8302ce2c038181c30060d0b40017b2 Fri Sep 28 16:51:48 CDT 2018 Eric Dumazet <edumazet@google.com> tun: initialize napi_mutex unconditionally
This is the first part to fix following syzbot report :
console output: https://syzkaller.appspot.com/x/log.txt?x=145378e6400000 kernel config: https://syzkaller.appspot.com/x/.config?x=443816db871edd66 dashboard link: https://syzkaller.appspot.com/bug?extid=e662df0ac1d753b57e80
Following patch is fixing the race condition, but it seems safer to initialize this mutex at tfile creation anyway.
Fixes: 90e33d459407 ("tun: enable napi_gro_frags() for TUN/TAP driver") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: syzbot+e662df0ac1d753b57e80@syzkaller.appspotmail.com Signed-off-by: David S. Miller <davem@davemloft.net>
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