vfs_shadow_copy2: in fstat also convert fsp->fsp_name and fsp->base_fsp->fsp_name

Stacked VFS modules might use the file name, not the file
handle. Looking at you, vfs_fruit...

Bug: https://bugzilla.samba.org/show_bug.cgi?id=13455

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
(cherry picked from commit aa1fac696956f96e89e54ddd4535a6e2844161b0)

Autobuild-User(v4-9-test): Karolin Seeger <kseeger@samba.org>
Autobuild-Date(v4-9-test): Thu Dec 13 16:47:40 CET 2018 on sn-devel-144

1 files changed, 50 insertions, 8 deletions

diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
index 746fbd470a9..06ef3ebc9b8 100644
--- a/source3/modules/vfs_shadow_copy2.c
+++ b/source3/modules/vfs_shadow_copy2.c
@@ -1354,21 +1354,63 @@ static int shadow_copy2_fstat(vfs_handle_struct *handle, files_struct *fsp,
 			      SMB_STRUCT_STAT *sbuf)
 {
 	time_t timestamp = 0;
+	struct smb_filename *orig_smb_fname = NULL;
+	struct smb_filename vss_smb_fname;
+	struct smb_filename *orig_base_smb_fname = NULL;
+	struct smb_filename vss_base_smb_fname;
+	char *stripped = NULL;
+	int saved_errno = 0;
+	bool ok;
 	int ret;
 
+	ok = shadow_copy2_strip_snapshot(talloc_tos(), handle,
+					 fsp->fsp_name->base_name,
+					 &timestamp, &stripped);
+	if (!ok) {
+		return -1;
+	}
+
+	if (timestamp == 0) {
+		TALLOC_FREE(stripped);
+		return SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
+	}
+
+	vss_smb_fname = *fsp->fsp_name;
+	vss_smb_fname.base_name = shadow_copy2_convert(talloc_tos(),
+						       handle,
+						       stripped,
+						       timestamp);
+	TALLOC_FREE(stripped);
+	if (vss_smb_fname.base_name == NULL) {
+		return -1;
+	}
+
+	orig_smb_fname = fsp->fsp_name;
+	fsp->fsp_name = &vss_smb_fname;
+
+	if (fsp->base_fsp != NULL) {
+		vss_base_smb_fname = *fsp->base_fsp->fsp_name;
+		vss_base_smb_fname.base_name = vss_smb_fname.base_name;
+		orig_base_smb_fname = fsp->base_fsp->fsp_name;
+		fsp->base_fsp->fsp_name = &vss_base_smb_fname;
+	}
+
 	ret = SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
-	if (ret == -1) {
-		return ret;
+	fsp->fsp_name = orig_smb_fname;
+	if (fsp->base_fsp != NULL) {
+		fsp->base_fsp->fsp_name = orig_base_smb_fname;
 	}
-	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
-					 fsp->fsp_name->base_name,
-					 &timestamp, NULL)) {
-		return 0;
+	if (ret == -1) {
+		saved_errno = errno;
 	}
-	if (timestamp != 0) {
+
+	if (ret == 0) {
 		convert_sbuf(handle, fsp->fsp_name->base_name, sbuf);
 	}
-	return 0;
+	if (saved_errno != 0) {
+		errno = saved_errno;
+	}
+	return ret;
 }
 
 static int shadow_copy2_open(vfs_handle_struct *handle,