[PATCH 5.4 103/240] random: check for crng_init == 0 in add_device_randomness()

Greg Kroah-Hartman
2022-06-20T13:46:16Z

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>
---
drivers/char/random.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1015,7 +1015,7 @@ void add_device_randomness(const void *b
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);