[PATCH 5.11 018/775] random: fix the RNDRESEEDCRNG ioctl

[Greg Kroah-Hartman]

From: Eric Biggers <ebiggers@xxxxxxxxxx>

commit 11a0b5e0ec8c13bef06f7414f9e914506140d5cb upstream.

The RNDRESEEDCRNG ioctl reseeds the primary_crng from itself, which
doesn't make sense.  Reseed it from the input_pool instead.

Fixes: d848e5f8e1eb ("random: add new ioctl RNDRESEEDCRNG")
Cc: stable@xxxxxxxxxxxxxxx
Cc: linux-crypto@xxxxxxxxxxxxxxx
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Jann Horn <jannh@xxxxxxxxxx>
Cc: Theodore Ts'o <tytso@xxxxxxx>
Reviewed-by: Jann Horn <jannh@xxxxxxxxxx>
Acked-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210112192818.69921-1-ebiggers@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/char/random.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1972,7 +1972,7 @@ static long random_ioctl(struct file *f,
 			return -EPERM;
 		if (crng_init < 2)
 			return -ENODATA;
-		crng_reseed(&primary_crng, NULL);
+		crng_reseed(&primary_crng, &input_pool);
 		crng_global_init_time = jiffies - 1;
 		return 0;
 	default: