EXFAT will fill zero data in truncated range.
Fix this by adding EXFAT_SUPER_MAGIC check.
Signed-off-by: MIngyi Cong <congmingyi@xxxxxxxxx>
---
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 ++-
include/uapi/linux/magic.h | 1 +
2 files changed, 3 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) {
diff --git a/include/uapi/linux/magic.h b/include/uapi/linux/magic.h
index 6325d1d0e90f..309cb3b5c5c4 100644
--- a/include/uapi/linux/magic.h
+++ b/include/uapi/linux/magic.h
@@ -46,6 +46,7 @@
#define MSDOS_SUPER_MAGIC 0x4d44 /* MD */
#define EXFAT_SUPER_MAGIC 0x2011BAB0
+#define HFS_SUPER_MAGIC 0x4244 /* "BD": HFS MDB (super block) */
#define NCP_SUPER_MAGIC 0x564c /* Guess, what 0x564c is :-) */
#define NFS_SUPER_MAGIC 0x6969
#define OCFS2_SUPER_MAGIC 0x7461636f
--
2.34.1
