diff --git a/crypto/cfb.c b/crypto/cfb.c
index 94ee39b..a0d68c0 100644
--- a/crypto/cfb.c
+++ b/crypto/cfb.c
@@ -53,9 +53,8 @@
 static void crypto_cfb_final(struct skcipher_walk *walk,
 			     struct crypto_skcipher *tfm)
 {
-	const unsigned int bsize = crypto_cfb_bsize(tfm);
 	const unsigned long alignmask = crypto_skcipher_alignmask(tfm);
-	u8 tmp[bsize + alignmask];
+	u8 tmp[MAX_CIPHER_BLOCKSIZE + MAX_CIPHER_ALIGNMASK];
 	u8 *stream = PTR_ALIGN(tmp + 0, alignmask + 1);
 	u8 *src = walk->src.virt.addr;
 	u8 *dst = walk->dst.virt.addr;
@@ -94,7 +93,7 @@
 	unsigned int nbytes = walk->nbytes;
 	u8 *src = walk->src.virt.addr;
 	u8 *iv = walk->iv;
-	u8 tmp[bsize];
+	u8 tmp[MAX_CIPHER_BLOCKSIZE];
 
 	do {
 		crypto_cfb_encrypt_one(tfm, iv, tmp);
@@ -164,7 +163,7 @@
 	unsigned int nbytes = walk->nbytes;
 	u8 *src = walk->src.virt.addr;
 	u8 *iv = walk->iv;
-	u8 tmp[bsize];
+	u8 tmp[MAX_CIPHER_BLOCKSIZE];
 
 	do {
 		crypto_cfb_encrypt_one(tfm, iv, tmp);