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random: clamp credited irq bits to maximum mixed

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commit e78a802a7b 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: e3e33fc2ea ("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>
This commit is contained in:
Jason A. Donenfeld 2022-09-23 02:42:51 +02:00 committed by Greg Kroah-Hartman
parent e1f8820bf8
commit b42a64428a
1 changed files with 1 additions and 1 deletions
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2
drivers/char/random.c
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@ -989,7 +989,7 @@ static void mix_interrupt_randomness(struct work_struct *work)
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));
}