linux-kernel - [PATCHv2] selinux: suppress a warning for 64k pages.

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Message-Id: <20071031164719.77f48d75.sfr@canb.auug.org.au>
Date:	Wed, 31 Oct 2007 16:47:19 +1100
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Serge Hallyn <sergeh@...ibm.com>
Cc:	Venkat Yekkirala <vyekkirala@...stedCS.com>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	James Morris <jmorris@...ei.org>,
	Eric Paris <eparis@...isplace.org>,
	<linux-kernel@...r.kernel.org>, <selinux@...ho.nsa.gov>
Subject: [PATCHv2] selinux: suppress a warning for 64k pages.

On PowerPC allmodconfig build we get this:

security/selinux/xfrm.c:214: warning: comparison is always false due to limited range of data type

Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 security/selinux/xfrm.c |   13 +++++++------
 1 files changed, 7 insertions(+), 6 deletions(-)

This version suppresses the warning without ugly ifdefs.
-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au

diff --git a/security/selinux/xfrm.c b/security/selinux/xfrm.c
index 36a191e..e076039 100644
--- a/security/selinux/xfrm.c
+++ b/security/selinux/xfrm.c
@@ -211,26 +211,27 @@ static int selinux_xfrm_sec_ctx_alloc(struct xfrm_sec_ctx **ctxp,
 	if (uctx->ctx_doi != XFRM_SC_ALG_SELINUX)
 		return -EINVAL;
 
-	if (uctx->ctx_len >= PAGE_SIZE)
+	str_len = uctx->ctx_len;
+	if (str_len >= PAGE_SIZE)
 		return -ENOMEM;
 
 	*ctxp = ctx = kmalloc(sizeof(*ctx) +
-			      uctx->ctx_len + 1,
+			      str_len + 1,
 			      GFP_KERNEL);
 
 	if (!ctx)
 		return -ENOMEM;
 
 	ctx->ctx_doi = uctx->ctx_doi;
-	ctx->ctx_len = uctx->ctx_len;
+	ctx->ctx_len = str_len;
 	ctx->ctx_alg = uctx->ctx_alg;
 
 	memcpy(ctx->ctx_str,
 	       uctx+1,
-	       ctx->ctx_len);
-	ctx->ctx_str[ctx->ctx_len] = 0;
+	       str_len);
+	ctx->ctx_str[str_len] = 0;
 	rc = security_context_to_sid(ctx->ctx_str,
-				     ctx->ctx_len,
+				     str_len,
 				     &ctx->ctx_sid);
 
 	if (rc)
-- 
1.5.3.4

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