[linux-pam] Fix strict aliasing issue in MD5 implementations.

[Tomáš Mráz]

commit 183f91a212879229d37e4dce18edd7a141eefa12
Author: Tomas Mraz <tmraz(a)fedoraproject.org&gt;
Date:   Thu Mar 28 15:30:19 2013 +0100

    Fix strict aliasing issue in MD5 implementations.
    
    modules/pam_namespace/md5.c (MD5Final): Use memcpy instead of assignment.
    modules/pam_unix/md5.c (MD5Final): Use memcpy instead of assignment.

 modules/pam_namespace/md5.c |    3 +--
 modules/pam_unix/md5.c      |    3 +--
 2 files changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/modules/pam_namespace/md5.c b/modules/pam_namespace/md5.c
index ce4f7d6..dc95ab1 100644
--- a/modules/pam_namespace/md5.c
+++ b/modules/pam_namespace/md5.c
@@ -142,8 +142,7 @@ void MD5Name(MD5Final)(unsigned char digest[16], struct MD5Context
*ctx)
 	byteReverse(ctx->in, 14);
 
 	/* Append length in bits and transform */
-	((uint32 *) ctx->in)[14] = ctx->bits[0];
-	((uint32 *) ctx->in)[15] = ctx->bits[1];
+	memcpy((uint32 *)ctx->in + 14, ctx->bits, 2*sizeof(uint32));
 
 	MD5Name(MD5Transform)(ctx->buf, (uint32 *) ctx->in);
 	byteReverse((unsigned char *) ctx->buf, 4);
diff --git a/modules/pam_unix/md5.c b/modules/pam_unix/md5.c
index 7881db5..94f0485 100644
--- a/modules/pam_unix/md5.c
+++ b/modules/pam_unix/md5.c
@@ -142,8 +142,7 @@ void MD5Name(MD5Final)(unsigned char digest[16], struct MD5Context
*ctx)
 	byteReverse(ctx->in, 14);
 
 	/* Append length in bits and transform */
-	((uint32 *) ctx->in)[14] = ctx->bits[0];
-	((uint32 *) ctx->in)[15] = ctx->bits[1];
+	memcpy((uint32 *)ctx->in + 14, ctx->bits, 2*sizeof(uint32));
 
 	MD5Name(MD5Transform)(ctx->buf, (uint32 *) ctx->in);
 	byteReverse((unsigned char *) ctx->buf, 4);