ksmbd: validate SMB2 write offsets

An SMB2 WRITE request with a negative offset returns -EINVAL directly
from smb2_write(). This bypasses the common error response path, leaving
the client waiting until the request times out.

ksmbd also allows nonempty writes at or beyond MAXFILESIZE as defined by
[MS-FSA]. Writes beyond the limit must fail with
STATUS_INVALID_PARAMETER. Writes ending at the limit fail with
STATUS_DISK_FULL, while a zero-length write remains valid.

Route negative offsets through the common error path and validate the end
offset of nonempty writes against MAXFILESIZE.

This fixes smb2.rw.invalid.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

0 files changed, 0 insertions, 0 deletions