From 06e710bd5faa886e9b5d032d375761de28fcef54 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Jan-Simon=20M=C3=B6ller?= Date: Thu, 29 Aug 2013 20:09:24 +0200 Subject: [PATCH] crypto: fcrypt - Fix bitoperation for compilation with clang MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit v2: Fix bug in statement as pointed out by Herbert Xu. Kudos to pipacs. Author: PaX Team ML-Post: http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20120507/142707.html URL: http://llvm.linuxfoundation.org Merge: Jan-Simon Möller Description: Fix for warning: linux/crypto/fcrypt.c:143:47: warning: signed shift result (0x598000000) requires 36 bits to represent, but 'int' only has 32 bits [-Wshift-overflow] Z(0xef), Z(0x70), Z(0xcf), Z(0xc2), Z(0x2a), Z(0xb3), Z(0x61), Z(0xad), ^~~~~~~ linux/crypto/fcrypt.c:113:29: note: expanded from macro 'Z' ^ ~~ linux/include/uapi/linux/byteorder/little_endian.h:38:53: note: expanded from macro '__cpu_to_be32' ^ linux/include/uapi/linux/swab.h:116:21: note: expanded from macro '__swab32' ___constant_swab32(x) : \ ^ linux/include/uapi/linux/swab.h:18:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ ^ Solution - make sure we don't exceed the 32 bit range. #define Z(x) cpu_to_be32(((x & 0x1f) << 27) | (x >> 5)) Signed-off-by: Jan-Simon Möller CC: pageexec@freemail.hu CC: llvmlinux@lists.linuxfoundation.org CC: behanw@converseincode.com CC: herbert@gondor.apana.org.au CC: davem@davemloft.net CC: linux-crypto@vger.kernel.org CC: linux-kernel@vger.kernel.org Signed-off-by: Herbert Xu --- crypto/fcrypt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/crypto/fcrypt.c b/crypto/fcrypt.c index 3b2cf569c684..021d7fec6bc8 100644 --- a/crypto/fcrypt.c +++ b/crypto/fcrypt.c @@ -110,7 +110,7 @@ static const __be32 sbox0[256] = { }; #undef Z -#define Z(x) cpu_to_be32((x << 27) | (x >> 5)) +#define Z(x) cpu_to_be32(((x & 0x1f) << 27) | (x >> 5)) static const __be32 sbox1[256] = { Z(0x77), Z(0x14), Z(0xa6), Z(0xfe), Z(0xb2), Z(0x5e), Z(0x8c), Z(0x3e), Z(0x67), Z(0x6c), Z(0xa1), Z(0x0d), Z(0xc2), Z(0xa2), Z(0xc1), Z(0x85),