From 3aaebc0cce4a4963f331f45643e17266646411e6 Mon Sep 17 00:00:00 2001 From: Basil Salman Date: Thu, 30 Apr 2020 15:11:40 +0300 Subject: qga-win: fix "guest-get-fsinfo" wrong filesystem type This patch handles the case where unmounted volumes exist, where in that case GetVolumePathNamesForVolumeName returns empty path, GetVolumeInformation will use the current working directory instead. This patch fixes the issue by opening a handle to the volumes, and using GetVolumeInformationByHandleW instead. Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1746667 Signed-off-by: Basil Salman Signed-off-by: Basil Salman *fix crash when guest_build_fsinfo() sets errp multiple times *make new error message more distinct from existing ones Signed-off-by: Michael Roth --- qga/commands-win32.c | 29 +++++++++++++++++++++++------ 1 file changed, 23 insertions(+), 6 deletions(-) diff --git a/qga/commands-win32.c b/qga/commands-win32.c index aaa71f147b..15c9d7944b 100644 --- a/qga/commands-win32.c +++ b/qga/commands-win32.c @@ -958,11 +958,13 @@ static GuestFilesystemInfo *build_guest_fsinfo(char *guid, Error **errp) { DWORD info_size; char mnt, *mnt_point; + wchar_t wfs_name[32]; char fs_name[32]; - char vol_info[MAX_PATH+1]; + wchar_t vol_info[MAX_PATH + 1]; size_t len; uint64_t i64FreeBytesToCaller, i64TotalBytes, i64FreeBytes; GuestFilesystemInfo *fs = NULL; + HANDLE hLocalDiskHandle = NULL; GetVolumePathNamesForVolumeName(guid, (LPCH)&mnt, 0, &info_size); if (GetLastError() != ERROR_MORE_DATA) { @@ -977,18 +979,27 @@ static GuestFilesystemInfo *build_guest_fsinfo(char *guid, Error **errp) goto free; } + hLocalDiskHandle = CreateFile(guid, 0 , 0, NULL, OPEN_EXISTING, + FILE_ATTRIBUTE_NORMAL | + FILE_FLAG_BACKUP_SEMANTICS, NULL); + if (INVALID_HANDLE_VALUE == hLocalDiskHandle) { + error_setg_win32(errp, GetLastError(), "failed to get handle for volume"); + goto free; + } + len = strlen(mnt_point); mnt_point[len] = '\\'; mnt_point[len+1] = 0; - if (!GetVolumeInformation(mnt_point, vol_info, sizeof(vol_info), NULL, NULL, - NULL, (LPSTR)&fs_name, sizeof(fs_name))) { + + if (!GetVolumeInformationByHandleW(hLocalDiskHandle, vol_info, + sizeof(vol_info), NULL, NULL, NULL, + (LPWSTR) & wfs_name, sizeof(wfs_name))) { if (GetLastError() != ERROR_NOT_READY) { error_setg_win32(errp, GetLastError(), "failed to get volume info"); } goto free; } - fs_name[sizeof(fs_name) - 1] = 0; fs = g_malloc(sizeof(*fs)); fs->name = g_strdup(guid); fs->has_total_bytes = false; @@ -1007,9 +1018,11 @@ static GuestFilesystemInfo *build_guest_fsinfo(char *guid, Error **errp) fs->has_used_bytes = true; } } + wcstombs(fs_name, wfs_name, sizeof(wfs_name)); fs->type = g_strdup(fs_name); fs->disk = build_guest_disk_info(guid, errp); free: + CloseHandle(hLocalDiskHandle); g_free(mnt_point); return fs; } @@ -1027,8 +1040,12 @@ GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp) } do { - GuestFilesystemInfo *info = build_guest_fsinfo(guid, errp); - if (info == NULL) { + Error *local_err = NULL; + GuestFilesystemInfo *info = build_guest_fsinfo(guid, &local_err); + if (local_err) { + g_debug("failed to get filesystem info, ignoring error: %s", + error_get_pretty(local_err)); + error_free(local_err); continue; } new = g_malloc(sizeof(*ret)); -- cgit v1.2.3