random: fix possible sleeping allocation from irq context
authorTheodore Ts'o <tytso@mit.edu>
Mon, 23 Apr 2018 22:51:28 +0000 (18:51 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 1 May 2018 22:13:03 +0000 (15:13 -0700)
commitc3ff2da5cef05676d490fa9057b2dceb5e48cdb9
tree2df33857ecec18f5bd76ae72c211387c388457af
parent2971585b27f6a810c50b6f3a9ac391aa4d13fdf5
random: fix possible sleeping allocation from irq context

commit 6c1e851c4edc13a43adb3ea4044e3fc8f43ccf7d upstream.

We can do a sleeping allocation from an irq context when CONFIG_NUMA
is enabled.  Fix this by initializing the NUMA crng instances in a
workqueue.

Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reported-by: syzbot+9de458f6a5e713ee8c1a@syzkaller.appspotmail.com
Fixes: 8ef35c866f8862df ("random: set up the NUMA crng instances...")
Cc: stable@vger.kernel.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/char/random.c