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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>
This commit is contained in:
Li Zefan 2011-07-14 03:16:00 +00:00 committed by Chris Mason
parent b783e62d96
commit 77906a5075
1 changed files with 1 additions and 2 deletions
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3
fs/btrfs/ioctl.c
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@ -1757,11 +1757,10 @@ static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
key.objectid = key.offset; key.objectid = key.offset;
key.offset = (u64)-1; key.offset = (u64)-1;
dirid = key.objectid; dirid = key.objectid;
} }
if (ptr < name) if (ptr < name)
goto out; goto out;
memcpy(name, ptr, total_len); memmove(name, ptr, total_len);
name[total_len]='\0'; name[total_len]='\0';
ret = 0; ret = 0;
out: out: