Re: [PATCH] crypto: padlock-aes: Use the correct mask when checkingwhether copying is required

From: Chuck Ebbert
Date: Mon Nov 02 2009 - 17:28:28 EST

crypto: padlock-aes: Use the correct mask when checking whether copying is required

Masking with PAGE_SIZE is just wrong...

Signed-off-by: Chuck Ebbert <cebbert@xxxxxxxxxx>

--- vanilla-2.6.31.orig/drivers/crypto/padlock-aes.c
+++ vanilla-2.6.31/drivers/crypto/padlock-aes.c
@@ -236,7 +236,7 @@ static inline void ecb_crypt(const u8 *i
/* Padlock in ECB mode fetches at least ecb_fetch_bytes of data.
* We could avoid some copying here but it's probably not worth it.
- if (unlikely(((unsigned long)in & PAGE_SIZE) + ecb_fetch_bytes > PAGE_SIZE)) {
+ if (unlikely(((unsigned long)in & ~PAGE_MASK) + ecb_fetch_bytes > PAGE_SIZE)) {
ecb_crypt_copy(in, out, key, cword, count);
@@ -248,7 +248,7 @@ static inline u8 *cbc_crypt(const u8 *in
u8 *iv, struct cword *cword, int count)
/* Padlock in CBC mode fetches at least cbc_fetch_bytes of data. */
- if (unlikely(((unsigned long)in & PAGE_SIZE) + cbc_fetch_bytes > PAGE_SIZE))
+ if (unlikely(((unsigned long)in & ~PAGE_MASK) + cbc_fetch_bytes > PAGE_SIZE))
return cbc_crypt_copy(in, out, key, iv, cword, count);

return rep_xcrypt_cbc(in, out, key, iv, cword, count);
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