| commit | 61f4b23769f0cc72ae62c9a81cf08f0397d40da8 | [log] [tgz] |
|---|---|---|
| author | Dmitry Safonov <dima@arista.com> | Mon Jul 30 18:32:36 2018 +0100 |
| committer | David S. Miller <davem@davemloft.net> | Mon Jul 30 12:42:22 2018 -0700 |
| tree | 14625a2389a9357a44870604c3bff5f80ee3edcd | |
| parent | af87f72e757a656d63c8410b1b0598b67d6a9ce3 [diff] |
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: 7acf9d4237c4 ("netlink: Do not subscribe to non-existent groups").
Reported-by: kernel test robot <rong.a.chen@intel.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>