linux-kernel - [PATCH] fs: fix a bug when new_insert

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Date:	Sat, 30 Jul 2016 11:51:09 +0800
From:	zhongjiang <zhongjiang@...wei.com>
To:	<akpm@...ux-foundation.org>
CC:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] fs: fix a bug when new_insert_key is not initialization

From: zhong jiang <zhongjiang@...wei.com>

when compile the kenrel code, I happens to the following warn.
fs/reiserfs/ibalance.c:1156:2: warning: ‘new_insert_key’ may be used
uninitialized in this function.
memcpy(new_insert_key_addr, &new_insert_key, KEY_SIZE);

The patch fix it by check the new_insert_ptr. if new_insert_ptr is not
NULL, we ensure that new_insert_key is assigned. therefore, memcpy will
saftly exec the operatetion.

Signed-off-by: zhong jiang <zhongjiang@...wei.com>
---
 fs/reiserfs/ibalance.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/reiserfs/ibalance.c b/fs/reiserfs/ibalance.c
index b751eea..2c46829 100644
--- a/fs/reiserfs/ibalance.c
+++ b/fs/reiserfs/ibalance.c
@@ -1153,8 +1153,10 @@ int balance_internal(struct tree_balance *tb,
 				       insert_ptr);
 	}
 
-	memcpy(new_insert_key_addr, &new_insert_key, KEY_SIZE);
-	insert_ptr[0] = new_insert_ptr;
+	if (new_insert_ptr) {
+		memcpy(new_insert_key_addr, &new_insert_key, KEY_SIZE);
+		insert_ptr[0] = new_insert_ptr;
+	}
 
 	return order;
 }
-- 
1.8.3.1