blk-crypto: fix check for too-large dun_bytes

From: Eric Biggers <[email protected]>

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.

---
 block/blk-crypto.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index c5bdaafffa29f..103c2e2d50d67 100644
@@ -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))

2.32.0

Applied, thanks.

Jens Axboe