From: Li Zefan <lizf@cn.fujitsu.com>
To: "linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
Subject: [PATCH] Btrfs: copy string correctly in BTRFS_IOC_INO_LOOKUP ioctl
Date: Mon, 20 Jun 2011 13:53:37 +0800 [thread overview]
Message-ID: <4DFEE061.1070604@cn.fujitsu.com> (raw)
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>
---
fs/btrfs/ioctl.c | 3 +--
1 files changed, 1 insertions(+), 2 deletions(-)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index b793d11..76f52b3 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1753,11 +1753,10 @@ 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:
-- 1.7.3.1
reply other threads:[~2011-06-20 5:53 UTC|newest]
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