This is a note to let you know that I've just added the patch titled
ksmbd: check invalid FileOffset and BeyondFinalZero in FSCTL_ZERO_DATA
to the 5.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ksmbd-check-invalid-fileoffset-and-beyondfinalzero-in-fsctl_zero_data.patch
and it can be found in the queue-5.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b5e5f9dfc915ff05b41dff56181e1dae101712bd Mon Sep 17 00:00:00 2001
From: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Date: Sun, 19 Jun 2022 22:37:17 +0900
Subject: ksmbd: check invalid FileOffset and BeyondFinalZero in FSCTL_ZERO_DATA
From: Namjae Jeon <linkinjeon@xxxxxxxxxx>
commit b5e5f9dfc915ff05b41dff56181e1dae101712bd upstream.
FileOffset should not be greater than BeyondFinalZero in FSCTL_ZERO_DATA.
And don't call ksmbd_vfs_zero_data() if length is zero.
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Hyunchul Lee <hyc.lee@xxxxxxxxx>
Signed-off-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ksmbd/smb2pdu.c | 29 ++++++++++++++++++-----------
1 file changed, 18 insertions(+), 11 deletions(-)
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -7705,7 +7705,7 @@ int smb2_ioctl(struct ksmbd_work *work)
{
struct file_zero_data_information *zero_data;
struct ksmbd_file *fp;
- loff_t off, len;
+ loff_t off, len, bfz;
if (!test_tree_conn_flag(work->tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
ksmbd_debug(SMB,
@@ -7722,19 +7722,26 @@ int smb2_ioctl(struct ksmbd_work *work)
zero_data =
(struct file_zero_data_information *)&req->Buffer[0];
- fp = ksmbd_lookup_fd_fast(work, id);
- if (!fp) {
- ret = -ENOENT;
+ off = le64_to_cpu(zero_data->FileOffset);
+ bfz = le64_to_cpu(zero_data->BeyondFinalZero);
+ if (off > bfz) {
+ ret = -EINVAL;
goto out;
}
- off = le64_to_cpu(zero_data->FileOffset);
- len = le64_to_cpu(zero_data->BeyondFinalZero) - off;
-
- ret = ksmbd_vfs_zero_data(work, fp, off, len);
- ksmbd_fd_put(work, fp);
- if (ret < 0)
- goto out;
+ len = bfz - off;
+ if (len) {
+ fp = ksmbd_lookup_fd_fast(work, id);
+ if (!fp) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ ret = ksmbd_vfs_zero_data(work, fp, off, len);
+ ksmbd_fd_put(work, fp);
+ if (ret < 0)
+ goto out;
+ }
break;
}
case FSCTL_QUERY_ALLOCATED_RANGES:
Patches currently in stable-queue which might be from linkinjeon@xxxxxxxxxx are
queue-5.18/ksmbd-check-invalid-fileoffset-and-beyondfinalzero-in-fsctl_zero_data.patch
queue-5.18/ksmbd-use-vfs_llseek-instead-of-dereferencing-null.patch
queue-5.18/ksmbd-set-the-range-of-bytes-to-zero-without-extending-file-size-in-fsctl_zero_data.patch
