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patch 8.1.1473: new resolve() implementation causes problem for plugins

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Problem:    New resolve() implementation causes problem for plugins.
Solution:   Only resolve a resparse point after checking it is needed. (Ken
            Takata, closes #4492)
This commit is contained in:
Bram Moolenaar
2019-06-06 12:22:41 +02:00
parent 61da1bfa6c
commit 4a792c87b9
3 changed files with 45 additions and 0 deletions
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39
src/os_mswin.c
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@@ -1753,6 +1753,39 @@ typedef BOOL (WINAPI *pfnGetVolumeInformationByHandleW)(
DWORD nFileSystemNameSize);
static pfnGetVolumeInformationByHandleW pGetVolumeInformationByHandleW = NULL;
# define is_path_sep(c) ((c) == L'\\' || (c) == L'/')
static int
is_reparse_point_included(LPCWSTR fname)
{
LPCWSTR p = fname, q;
WCHAR buf[MAX_PATH];
DWORD attr;
if (isalpha(p[0]) && p[1] == L':' && is_path_sep(p[2]))
p += 3;
else if (is_path_sep(p[0]) && is_path_sep(p[1]))
p += 2;
while (*p != L'\0')
{
q = wcspbrk(p, L"\\/");
if (q == NULL)
p = q = fname + wcslen(fname);
else
p = q + 1;
if (q - fname >= MAX_PATH)
return FALSE;
wcsncpy(buf, fname, q - fname);
buf[q - fname] = L'\0';
attr = GetFileAttributesW(buf);
if (attr != INVALID_FILE_ATTRIBUTES
&& (attr & FILE_ATTRIBUTE_REPARSE_POINT) != 0)
return TRUE;
}
return FALSE;
}
static char_u *
resolve_reparse_point(char_u *fname)
{
@@ -1787,6 +1820,12 @@ resolve_reparse_point(char_u *fname)
if (p == NULL)
goto fail;
if (!is_reparse_point_included(p))
{
vim_free(p);
goto fail;
}
h = CreateFileW(p, 0, 0, NULL, OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS, NULL);
vim_free(p);