ksmbd: skip lock-range check on equal size to avoid size==0 underflow

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commit 5d510ac316 upstream.

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.

Cc: stable@vger.kernel.org
Reported-by: Qianchang Zhao <pioooooooooip@gmail.com>
Reported-by: Zhitong Liu <liuzhitong1993@gmail.com>
Signed-off-by: Qianchang Zhao <pioooooooooip@gmail.com>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Qianchang Zhao 2025-11-09 10:00:55 +09:00 • committed by Greg Kroah-Hartman

parent 3041d93301

commit 571204e475

1 changed files with 4 additions and 1 deletions

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fs/smb/server/vfs.c

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