random: check for crng_init == 0 in add_device_randomness()

commit 1daf2f387652bf3a7044aea042f5023b3f6b189b upstream.

This has no real functional change, as crng_pre_init_inject() (and
before that, crng_slow_init()) always checks for == 0, not >= 2. So
correct the outer unlocked change to reflect that. Before this used
crng_ready(), which was not correct.

Cc: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/char/random.c b/drivers/char/random.c
index fdfb0de..adf42f7 100644 (file)
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1020,7 +1020,7 @@ void add_device_randomness(const void *buf, size_t size)
        unsigned long time = random_get_entropy() ^ jiffies;
        unsigned long flags;
 
-       if (!crng_ready() && size)
+       if (crng_init == 0 && size)
                crng_pre_init_inject(buf, size, false, false);
 
        spin_lock_irqsave(&input_pool.lock, flags);