From: Li Zefan <lizf@cn.fujitsu.com>
Date: Thu, 14 Jul 2011 03:16:00 +0000 (+0000)
Subject: Btrfs: copy string correctly in INO_LOOKUP ioctl
X-Git-Tag: v3.1-rc6~4^2~38
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=77906a5075a4eb767026c2e07b1a412d08aea5be;p=platform%2Fkernel%2Flinux-exynos.git

Btrfs: copy string correctly in INO_LOOKUP ioctl

Memory areas [ptr, ptr+total_len] and [name, name+total_len]
may overlap, so it's wrong to use memcpy().

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
---

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index fd252ff..2bb0886 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1757,11 +1757,10 @@ static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
 		key.objectid = key.offset;
 		key.offset = (u64)-1;
 		dirid = key.objectid;
-
 	}
 	if (ptr < name)
 		goto out;
-	memcpy(name, ptr, total_len);
+	memmove(name, ptr, total_len);
 	name[total_len]='\0';
 	ret = 0;
 out: