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ksmbd: check invalid FileOffset and BeyondFinalZero in FSCTL_ZERO_DATA

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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@vger.kernel.org
Reviewed-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Namjae Jeon 2022-06-19 22:37:17 +09:00 committed by Steve French
parent 18e39fb960
commit b5e5f9dfc9
1 changed files with 17 additions and 10 deletions
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27
fs/ksmbd/smb2pdu.c
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@ -7700,7 +7700,7 @@ 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,
@ -7717,19 +7717,26 @@ 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;
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;
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: