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

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Message-Id: <200910272325.n9RNPYfr002918@int-mx08.intmail.prod.int.phx2.redhat.com>
Date:	Tue, 27 Oct 2009 19:25:33 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: [PATCH] crypto: padlock-aes: Use the correct mask when checking
 whether copying is required

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

Masking with PAGE_SIZE is just wrong... and there's no need for the braces and return
statement either.

Signed-off-by: Chuck Ebbert <cebbert@...hat.com>

---
Can we get this in 2.6.32 and -stable? It fixes a fatal oops in the driver.

--- a/drivers/crypto/padlock-aes.c
+++ b/drivers/crypto/padlock-aes.c
@@ -236,19 +236,17 @@ 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;
-	}
-
-	rep_xcrypt_ecb(in, out, key, cword, count);
+	else
+		rep_xcrypt_ecb(in, out, key, cword, count);
 }
 
 static inline u8 *cbc_crypt(const u8 *in, u8 *out, u32 *key,
 			    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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