From: Jason A. Donenfeld Jason@zx2c4.com
commit e78a802a7b4febf53f2a92842f494b01062d85a8 upstream.
Since the most that's mixed into the pool is sizeof(long)*2, don't credit more than that many bytes of entropy.
Fixes: e3e33fc2ea7f ("random: do not use input pool from hard IRQs") Cc: stable@vger.kernel.org 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 @@ -989,7 +989,7 @@ static void mix_interrupt_randomness(str local_irq_enable();
mix_pool_bytes(pool, sizeof(pool)); - credit_init_bits(max(1u, (count & U16_MAX) / 64)); + credit_init_bits(clamp_t(unsigned int, (count & U16_MAX) / 64, 1, sizeof(pool) * 8));
memzero_explicit(pool, sizeof(pool)); }