Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Mingyi Cong <congmingyi@gmail.com>
To:     linkinjeon@kernel.org, senozhatsky@chromium.org, sfrench@samba.org,
        tom@talpey.com
Cc:     congmingyi@gmail.com, linux-kernel@vger.kernel.org,
        linux-cifs@vger.kernel.org
Subject: [PATCH v3] fs: add the tuncate check of exfat
Date:   Tue, 28 Mar 2023 21:13:34 +0800
Message-Id: <20230328131334.5572-1-congmingyi@gmail.com>
In-Reply-To: <CAKYAXd8GzB_onCcs=2aZs0MGTy_7oGhECEdr+rcdVS+Jf2C5xQ@mail.gmail.com>
References: <CAKYAXd8GzB_onCcs=2aZs0MGTy_7oGhECEdr+rcdVS+Jf2C5xQ@mail.gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: MIngyi Cong <congmingyi@gmail.com>

EXFAT will fill zero data in truncated range.
Fix this by adding EXFAT_SUPER_MAGIC check.

Signed-off-by: MIngyi Cong <congmingyi@gmail.com>
---
 fs/ksmbd/smb2pdu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 0685c1c77b9f..3f2e34936b8d 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -5746,7 +5746,8 @@ static int set_end_of_file_info(struct ksmbd_work *work, struct ksmbd_file *fp,
 	 * truncate of some filesystem like FAT32 fill zero data in
 	 * truncated range.
 	 */
-	if (inode->i_sb->s_magic != MSDOS_SUPER_MAGIC) {
+	if (inode->i_sb->s_magic != MSDOS_SUPER_MAGIC ||
+		inode->i_sb->s_magic != EXFAT_SUPER_MAGIC) {
 		ksmbd_debug(SMB, "truncated to newsize %lld\n", newsize);
 		rc = ksmbd_vfs_truncate(work, fp, newsize);
 		if (rc) {
-- 
2.34.1