linux-kernel - [PATCH 02/12] cifs: Fix calling CIFSFindFirst() for root path without msearch

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Message-Id: <20241231223642.15722-2-pali@kernel.org>
Date: Tue, 31 Dec 2024 23:36:32 +0100
From: Pali Rohár <pali@...nel.org>
To: Steve French <sfrench@...ba.org>,
	Paulo Alcantara <pc@...guebit.com>
Cc: linux-cifs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 02/12] cifs: Fix calling CIFSFindFirst() for root path without msearch

To query root path (without msearch wildcard) it is needed to
send pattern "\" instead of "" (empty string).

This allows to use CIFSFindFirst() to query information about root path.

Signed-off-by: Pali Rohár <pali@...nel.org>
---
 fs/smb/client/cifssmb.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/fs/smb/client/cifssmb.c b/fs/smb/client/cifssmb.c
index 604e204e3f57..7c42a0651138 100644
--- a/fs/smb/client/cifssmb.c
+++ b/fs/smb/client/cifssmb.c
@@ -4108,6 +4108,12 @@ CIFSFindFirst(const unsigned int xid, struct cifs_tcon *tcon,
 			pSMB->FileName[name_len] = 0;
 			pSMB->FileName[name_len+1] = 0;
 			name_len += 2;
+		} else if (!searchName[0]) {
+			pSMB->FileName[0] = CIFS_DIR_SEP(cifs_sb);
+			pSMB->FileName[1] = 0;
+			pSMB->FileName[2] = 0;
+			pSMB->FileName[3] = 0;
+			name_len = 4;
 		}
 	} else {
 		name_len = copy_path_name(pSMB->FileName, searchName);
@@ -4119,6 +4125,10 @@ CIFSFindFirst(const unsigned int xid, struct cifs_tcon *tcon,
 			pSMB->FileName[name_len] = '*';
 			pSMB->FileName[name_len+1] = 0;
 			name_len += 2;
+		} else if (!searchName[0]) {
+			pSMB->FileName[0] = CIFS_DIR_SEP(cifs_sb);
+			pSMB->FileName[1] = 0;
+			name_len = 2;
 		}
 	}
 
-- 
2.20.1