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dll: fuse: truncate fixed size options

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Some options (VolumePrefix, FileSystemName, volname) have a fixed maximum size.
This commit adds functionality to truncate user-specified long options to their fixed maximum size.
This commit is contained in:
Bill Zissimopoulos 2020-12-22 15:44:37 -08:00
parent 2d5d058d2f
commit c803ef24f8
No known key found for this signature in database
GPG Key ID: 3D4F95D52C7B3EA3
1 changed files with 61 additions and 4 deletions
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65
src/dll/fuse/fuse.c
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@ -303,6 +303,63 @@ static int fsp_fuse_username_to_uid(const char *username, int *puid)
return 0;
}
static int fsp_fuse_utf8towcs_trunc(
const char *Str, int StrLen,
PWSTR Wcs, int WcsLen)
{
if (0 == StrLen)
return 0;
int Size = MultiByteToWideChar(CP_UTF8, 0, Str, StrLen, Wcs, WcsLen);
if (0 != Size)
return Size;
if (0 == WcsLen)
return 0;
PWSTR Buf = 0;
Size = MultiByteToWideChar(CP_UTF8, 0, Str, StrLen, 0, 0);
if (0 == Size)
goto exit;
Buf = MemAlloc(Size * sizeof(WCHAR));
if (0 == Buf)
{
SetLastError(ERROR_NO_SYSTEM_RESOURCES);
Size = 0;
goto exit;
}
Size = MultiByteToWideChar(CP_UTF8, 0, Str, StrLen, Buf, Size);
if (0 == Size)
goto exit;
if (-1 == StrLen)
{
if (Size >= WcsLen)
{
Size = WcsLen - 1;
memcpy(Wcs, Buf, Size * sizeof(WCHAR));
Wcs[Size] = L'\0';
Size++;
}
else
memcpy(Wcs, Buf, Size * sizeof(WCHAR));
}
else
{
if (Size >= WcsLen)
Size = WcsLen;
memcpy(Wcs, Buf, Size * sizeof(WCHAR));
}
exit:
MemFree(Buf);
return Size;
}
static int fsp_fuse_core_opt_proc(void *opt_data0, const char *arg, int key,
struct fuse_args *outargs)
{
@ -367,7 +424,7 @@ static int fsp_fuse_core_opt_proc(void *opt_data0, const char *arg, int key,
arg += sizeof "VolumePrefix=" - 1;
else if ('V' == arg[2])
arg += sizeof "--VolumePrefix=" - 1;
if (0 == MultiByteToWideChar(CP_UTF8, 0, arg, -1,
if (0 == fsp_fuse_utf8towcs_trunc(arg, -1,
opt_data->VolumeParams.Prefix, sizeof opt_data->VolumeParams.Prefix / sizeof(WCHAR)))
return -1;
opt_data->VolumeParams.Prefix
@ -383,7 +440,7 @@ static int fsp_fuse_core_opt_proc(void *opt_data0, const char *arg, int key,
arg += sizeof "FileSystemName=" - 1;
else if ('F' == arg[2])
arg += sizeof "--FileSystemName=" - 1;
if (0 == MultiByteToWideChar(CP_UTF8, 0, arg, -1,
if (0 == fsp_fuse_utf8towcs_trunc(arg, -1,
opt_data->VolumeParams.FileSystemName + 5,
sizeof opt_data->VolumeParams.FileSystemName / sizeof(WCHAR) - 5))
return -1;
@ -396,7 +453,7 @@ static int fsp_fuse_core_opt_proc(void *opt_data0, const char *arg, int key,
arg += sizeof "ExactFileSystemName=" - 1;
else if ('E' == arg[2])
arg += sizeof "--ExactFileSystemName=" - 1;
if (0 == MultiByteToWideChar(CP_UTF8, 0, arg, -1,
if (0 == fsp_fuse_utf8towcs_trunc(arg, -1,
opt_data->VolumeParams.FileSystemName,
sizeof opt_data->VolumeParams.FileSystemName / sizeof(WCHAR)))
return -1;
@ -428,7 +485,7 @@ static int fsp_fuse_core_opt_proc(void *opt_data0, const char *arg, int key,
case 'v':
arg += sizeof "volname=" - 1;
opt_data->VolumeLabelLength = (UINT16)(sizeof(WCHAR) *
MultiByteToWideChar(CP_UTF8, 0, arg, lstrlenA(arg),
fsp_fuse_utf8towcs_trunc(arg, lstrlenA(arg),
opt_data->VolumeLabel, sizeof opt_data->VolumeLabel / sizeof(WCHAR)));
if (0 == opt_data->VolumeLabelLength)
return -1;