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Commit 61f4b237 authored by Dmitry Safonov's avatar Dmitry Safonov Committed by David S. Miller
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netlink: Don't shift with UB on nlk->ngroups



On i386 nlk->ngroups might be 32 or 0. Which leads to UB, resulting in
hang during boot.
Check for 0 ngroups and use (unsigned long long) as a type to shift.

Fixes: 7acf9d42 ("netlink: Do not subscribe to non-existent groups").
Reported-by: default avatarkernel test robot <rong.a.chen@intel.com>
Signed-off-by: default avatarDmitry Safonov <dima@arista.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent af87f72e
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