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blk-crypto: fix check for too-large dun_bytes

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[ Upstream commit cc40b7225151f611ef837f6403cfaeadc7af214a ]

dun_bytes needs to be less than or equal to the IV size of the
encryption mode, not just less than or equal to BLK_CRYPTO_MAX_IV_SIZE.

Currently this doesn't matter since blk_crypto_init_key() is never
actually passed invalid values, but we might as well fix this.

Fixes: a892c8d52c ("block: Inline encryption support for blk-mq")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20210825055918.51975-1-ebiggers@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Biggers 2021-08-24 22:59:18 -07:00 committed by Greg Kroah-Hartman
parent 81ff155555
commit 9ea94e02ac
1 changed files with 1 additions and 1 deletions
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2
block/blk-crypto.c
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@ -332,7 +332,7 @@ int blk_crypto_init_key(struct blk_crypto_key *blk_key, const u8 *raw_key,
if (mode->keysize == 0)
return -EINVAL;
if (dun_bytes == 0 || dun_bytes > BLK_CRYPTO_MAX_IV_SIZE)
if (dun_bytes == 0 || dun_bytes > mode->ivsize)
return -EINVAL;
if (!is_power_of_2(data_unit_size))