linux-kernel - [PATCH -next] kasan/tags: fix -Wdeclaration-after-statement warn

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Message-Id: <1583509030-27939-1-git-send-email-cai@lca.pw>
Date:   Fri,  6 Mar 2020 10:37:10 -0500
From:   Qian Cai <cai@....pw>
To:     akpm@...ux-foundation.org
Cc:     aryabinin@...tuozzo.com, glider@...gle.com, dvyukov@...gle.com,
        walter-zh.wu@...iatek.com, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Qian Cai <cai@....pw>
Subject: [PATCH -next] kasan/tags: fix -Wdeclaration-after-statement warn

The linux-next commit "kasan: detect negative size in memory operation
function" introduced a compilation warning,

mm/kasan/tags_report.c:51:27: warning: ISO C90 forbids mixing
declarations and code [-Wdeclaration-after-statement]
        struct kasan_alloc_meta *alloc_meta;

Fix it by moving a code around a bit where there is no strict
dependency.

Signed-off-by: Qian Cai <cai@....pw>
---
 mm/kasan/tags_report.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/mm/kasan/tags_report.c b/mm/kasan/tags_report.c
index 1d412760551a..bee43717d6f0 100644
--- a/mm/kasan/tags_report.c
+++ b/mm/kasan/tags_report.c
@@ -36,17 +36,6 @@
 
 const char *get_bug_type(struct kasan_access_info *info)
 {
-	/*
-	 * If access_size is a negative number, then it has reason to be
-	 * defined as out-of-bounds bug type.
-	 *
-	 * Casting negative numbers to size_t would indeed turn up as
-	 * a large size_t and its value will be larger than ULONG_MAX/2,
-	 * so that this can qualify as out-of-bounds.
-	 */
-	if (info->access_addr + info->access_size < info->access_addr)
-		return "out-of-bounds";
-
 #ifdef CONFIG_KASAN_SW_TAGS_IDENTIFY
 	struct kasan_alloc_meta *alloc_meta;
 	struct kmem_cache *cache;
@@ -71,6 +60,17 @@ const char *get_bug_type(struct kasan_access_info *info)
 	}
 
 #endif
+	/*
+	 * If access_size is a negative number, then it has reason to be
+	 * defined as out-of-bounds bug type.
+	 *
+	 * Casting negative numbers to size_t would indeed turn up as
+	 * a large size_t and its value will be larger than ULONG_MAX/2,
+	 * so that this can qualify as out-of-bounds.
+	 */
+	if (info->access_addr + info->access_size < info->access_addr)
+		return "out-of-bounds";
+
 	return "invalid-access";
 }
 
-- 
1.8.3.1