linux-kernel - [PATCH v3] fs: add the tuncate check of exfat

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Date:   Thu, 16 Mar 2023 22:45:17 +0800
From:   MIngyi Cong <congmingyi@...il.com>
To:     linkinjeon@...nel.org, senozhatsky@...omium.org, sfrench@...ba.org,
        tom@...pey.com
Cc:     congmingyi@...il.com, linux-kernel@...r.kernel.org,
        linux-cifs@...r.kernel.org
Subject: [PATCH v3] fs: add the tuncate check of exfat

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

Signed-off-by: MIngyi Cong <congmingyi@...il.com>
---
 V1 -> V2: add the truncate check of hfs and remove EXFAT_SUPER_MAGIC in magic.h
 V2 -> V3: remove the truncate check of hfs and hfsplus
 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