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

[Chuck Ebbert <cebbert@redhat.com>]

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@redhat.com>

--- 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);
 		return;
 	}
@@ -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);