linux-kernel - [PATCH 3/4] crypto: Change LZ4 modules to work with new LZ4 module version

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Date:   Sat, 21 Jan 2017 16:09:10 +0100
From:   Sven Schmidt <4sschmid@...ormatik.uni-hamburg.de>
To:     akpm@...ux-foundation.org
Cc:     bongkyu.kim@....com, rsalvaterra@...il.com,
        sergey.senozhatsky@...il.com, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, herbert@...dor.apana.org.au,
        davem@...emloft.net, linux-crypto@...r.kernel.org,
        anton@...msg.org, ccross@...roid.com, keescook@...omium.org,
        tony.luck@...el.com, phillip@...ashfs.org.uk,
        Sven Schmidt <4sschmid@...ormatik.uni-hamburg.de>
Subject: [PATCH 3/4] crypto: Change LZ4 modules to work with new LZ4 module version

This patch updates the crypto modules using LZ4 compression
to work with the new LZ4 module version.

Signed-off-by: Sven Schmidt <4sschmid@...ormatik.uni-hamburg.de>
---
 crypto/lz4.c   | 21 ++++++++-------------
 crypto/lz4hc.c | 21 ++++++++-------------
 2 files changed, 16 insertions(+), 26 deletions(-)

diff --git a/crypto/lz4.c b/crypto/lz4.c
index 99c1b2c..40fd2c2 100644
--- a/crypto/lz4.c
+++ b/crypto/lz4.c
@@ -66,15 +66,13 @@ static void lz4_exit(struct crypto_tfm *tfm)
 static int __lz4_compress_crypto(const u8 *src, unsigned int slen,
 				 u8 *dst, unsigned int *dlen, void *ctx)
 {
-	size_t tmp_len = *dlen;
-	int err;
+	int out_len = LZ4_compress_default(src, dst,
+		slen, (int)((size_t)dlen), ctx);
 
-	err = lz4_compress(src, slen, dst, &tmp_len, ctx);
-
-	if (err < 0)
+	if (!out_len)
 		return -EINVAL;
 
-	*dlen = tmp_len;
+	*dlen = out_len;
 	return 0;
 }
 
@@ -96,16 +94,13 @@ static int lz4_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
 static int __lz4_decompress_crypto(const u8 *src, unsigned int slen,
 				   u8 *dst, unsigned int *dlen, void *ctx)
 {
-	int err;
-	size_t tmp_len = *dlen;
-	size_t __slen = slen;
+	int out_len = LZ4_decompress_safe(src, dst, slen, (int)((size_t)dlen));
 
-	err = lz4_decompress_unknownoutputsize(src, __slen, dst, &tmp_len);
-	if (err < 0)
+	if (out_len < 0)
 		return -EINVAL;
 
-	*dlen = tmp_len;
-	return err;
+	*dlen = out_len;
+	return out_len;
 }
 
 static int lz4_sdecompress(struct crypto_scomp *tfm, const u8 *src,
diff --git a/crypto/lz4hc.c b/crypto/lz4hc.c
index 75ffc4a..6f16f96 100644
--- a/crypto/lz4hc.c
+++ b/crypto/lz4hc.c
@@ -65,15 +65,13 @@ static void lz4hc_exit(struct crypto_tfm *tfm)
 static int __lz4hc_compress_crypto(const u8 *src, unsigned int slen,
 				   u8 *dst, unsigned int *dlen, void *ctx)
 {
-	size_t tmp_len = *dlen;
-	int err;
+	int out_len = LZ4_compress_HC(src, dst, slen,
+		(int)((size_t)dlen), LZ4HC_DEFAULT_CLEVEL, ctx);
 
-	err = lz4hc_compress(src, slen, dst, &tmp_len, ctx);
-
-	if (err < 0)
+	if (out_len == 0)
 		return -EINVAL;
 
-	*dlen = tmp_len;
+	*dlen = out_len;
 	return 0;
 }
 
@@ -97,16 +95,13 @@ static int lz4hc_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
 static int __lz4hc_decompress_crypto(const u8 *src, unsigned int slen,
 				     u8 *dst, unsigned int *dlen, void *ctx)
 {
-	int err;
-	size_t tmp_len = *dlen;
-	size_t __slen = slen;
+	int out_len = LZ4_decompress_safe(src, dst, slen, (int)((size_t)dlen));
 
-	err = lz4_decompress_unknownoutputsize(src, __slen, dst, &tmp_len);
-	if (err < 0)
+	if (out_len < 0)
 		return -EINVAL;
 
-	*dlen = tmp_len;
-	return err;
+	*dlen = out_len;
+	return out_len;
 }
 
 static int lz4hc_sdecompress(struct crypto_scomp *tfm, const u8 *src,
-- 
2.1.4