Re: [PATCH v2] ksmbd: vfs: skip lock-range check on equal size to avoid size==0 underflow

On Sun, Nov 9, 2025 at 12:57 AM Qianchang Zhao pioooooooooip@gmail.com wrote:

When size equals the current i_size (including 0), the code used to call check_lock_range(filp, i_size, size - 1, WRITE), which computes `size - 1` and can underflow for size==0. Skip the equal case.

Reported-by: Qianchang Zhao pioooooooooip@gmail.com Reported-by: Zhitong Liu liuzhitong1993@gmail.com Cc: stable@vger.kernel.org Signed-off-by: Qianchang Zhao pioooooooooip@gmail.com

Applied it to #ksmbd-for-next-next. Thanks!