[PATCH 6/7] crypto: x86/aes-xts - change len parameter to int

[Eric Biggers <ebiggers@kernel.org>]

From: Eric Biggers <ebiggers@google.com>

The AES-XTS assembly code currently treats the length as signed, since
this saves a few instructions in the loop compared to treating it as
unsigned.  Therefore update the type to make this clear.  (It is not
actually passed any values larger than PAGE_SIZE.)

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 arch/x86/crypto/aes-xts-avx-x86_64.S |  2 +-
 arch/x86/crypto/aesni-intel_glue.c   | 10 +++++-----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/x86/crypto/aes-xts-avx-x86_64.S b/arch/x86/crypto/aes-xts-avx-x86_64.S
index a94f02b7c5b47..bb3d0dfeca575 100644
--- a/arch/x86/crypto/aes-xts-avx-x86_64.S
+++ b/arch/x86/crypto/aes-xts-avx-x86_64.S
@@ -777,11 +777,11 @@ SYM_FUNC_END(aes_xts_encrypt_iv)
 
 // Below are the actual AES-XTS encryption and decryption functions,
 // instantiated from the above macro.  They all have the following prototype:
 //
 // void (*xts_crypt_func)(const struct crypto_aes_ctx *key,
-//			  const u8 *src, u8 *dst, unsigned int len,
+//			  const u8 *src, u8 *dst, int len,
 //			  u8 tweak[AES_BLOCK_SIZE]);
 //
 // |key| is the data key.  |tweak| contains the next tweak; the encryption of
 // the original IV with the tweak key was already done.  This function supports
 // incremental computation, but |len| must always be >= 16 (AES_BLOCK_SIZE), and
diff --git a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c
index fbf43482e1f5e..11e95fc62636e 100644
--- a/arch/x86/crypto/aesni-intel_glue.c
+++ b/arch/x86/crypto/aesni-intel_glue.c
@@ -503,11 +503,11 @@ static int xts_setkey_aesni(struct crypto_skcipher *tfm, const u8 *key,
 }
 
 typedef void (*xts_encrypt_iv_func)(const struct crypto_aes_ctx *tweak_key,
 				    u8 iv[AES_BLOCK_SIZE]);
 typedef void (*xts_crypt_func)(const struct crypto_aes_ctx *key,
-			       const u8 *src, u8 *dst, unsigned int len,
+			       const u8 *src, u8 *dst, int len,
 			       u8 tweak[AES_BLOCK_SIZE]);
 
 /* This handles cases where the source and/or destination span pages. */
 static noinline int
 xts_crypt_slowpath(struct skcipher_request *req, xts_crypt_func crypt_func)
@@ -622,18 +622,18 @@ static void aesni_xts_encrypt_iv(const struct crypto_aes_ctx *tweak_key,
 {
 	aesni_enc(tweak_key, iv, iv);
 }
 
 static void aesni_xts_encrypt(const struct crypto_aes_ctx *key,
-			      const u8 *src, u8 *dst, unsigned int len,
+			      const u8 *src, u8 *dst, int len,
 			      u8 tweak[AES_BLOCK_SIZE])
 {
 	aesni_xts_enc(key, dst, src, len, tweak);
 }
 
 static void aesni_xts_decrypt(const struct crypto_aes_ctx *key,
-			      const u8 *src, u8 *dst, unsigned int len,
+			      const u8 *src, u8 *dst, int len,
 			      u8 tweak[AES_BLOCK_SIZE])
 {
 	aesni_xts_dec(key, dst, src, len, tweak);
 }
 
@@ -788,14 +788,14 @@ asmlinkage void aes_xts_encrypt_iv(const struct crypto_aes_ctx *tweak_key,
 
 #define DEFINE_XTS_ALG(suffix, driver_name, priority)			       \
 									       \
 asmlinkage void								       \
 aes_xts_encrypt_##suffix(const struct crypto_aes_ctx *key, const u8 *src,      \
-			 u8 *dst, unsigned int len, u8 tweak[AES_BLOCK_SIZE]); \
+			 u8 *dst, int len, u8 tweak[AES_BLOCK_SIZE]);	       \
 asmlinkage void								       \
 aes_xts_decrypt_##suffix(const struct crypto_aes_ctx *key, const u8 *src,      \
-			 u8 *dst, unsigned int len, u8 tweak[AES_BLOCK_SIZE]); \
+			 u8 *dst, int len, u8 tweak[AES_BLOCK_SIZE]);	       \
 									       \
 static int xts_encrypt_##suffix(struct skcipher_request *req)		       \
 {									       \
 	return xts_crypt(req, aes_xts_encrypt_iv, aes_xts_encrypt_##suffix);   \
 }									       \
-- 
2.47.1