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Cygwin: path: Fix UNC path handling for SMB3 mounted to a drive. 

- If an UNC path is mounted to a drive using SMB3.11, accessing to
  the drive fails with error "Too many levels of symbolic links."
  This patch fixes the issue.
This commit is contained in:
Takashi Yano 2022-02-03 12:00:14 +09:00
parent 4a70041dfd
commit e5aca9ced9
1 changed files with 11 additions and 2 deletions
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13
winsup/cygwin/path.cc
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@ -3495,10 +3495,19 @@ restart:
/* If incoming path has no trailing backslash, but final path
has one, drop trailing backslash from final path so the
below string comparison has a chance to succeed. */
below string comparison has a chance to succeed.
On the contrary, if incoming path has trailing backslash,
but final path does not have one, add trailing backslash
to the final path. */
if (upath.Buffer[(upath.Length - 1) / sizeof (WCHAR)] != L'\\'
&& fpbuf[ret - 1] == L'\\')
&& fpbuf[ret - 1] == L'\\')
fpbuf[--ret] = L'\0';
if (upath.Buffer[(upath.Length - 1) / sizeof (WCHAR)] == L'\\'
&& fpbuf[ret - 1] != L'\\' && ret < NT_MAX_PATH - 1)
{
fpbuf[ret++] = L'\\';
fpbuf[ret] = L'\0';
}
fpbuf[1] = L'?'; /* \\?\ --> \??\ */
RtlInitCountedUnicodeString (&fpath, fpbuf, ret * sizeof (WCHAR));
if (!RtlEqualUnicodeString (&upath, &fpath, !!ci_flag))