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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -800,7 +800,7 @@ static void crng_initialize(struct crng_state *crng)
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}
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#ifdef CONFIG_NUMA
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static void numa_crng_init(void)
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static void do_numa_crng_init(struct work_struct *work)
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{
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int i;
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struct crng_state *crng;
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@ -821,6 +821,13 @@ static void numa_crng_init(void)
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kfree(pool);
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}
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}
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static DECLARE_WORK(numa_crng_init_work, do_numa_crng_init);
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static void numa_crng_init(void)
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{
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schedule_work(&numa_crng_init_work);
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}
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#else
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static void numa_crng_init(void) {}
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#endif
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