From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 27F893DB31A; Sat, 12 Sep 2026 11:54:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789214065; cv=none; b=Gtq1LUrgDMRR7j5KUJ7Vde1dKEK5GHhMCLsS9ouK7097TNnkuoYUEIoqTRziMlNL9z6hROzqENVVRskW5Jb+MJ0VbGuTD6PmChKGpKk8tF10GnnwjqBZFPHCPnQ0eonp5cvjlEf9xoEF/V1GP3NMtuSnW6BrCU+agCYJNioEq5w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789214065; c=relaxed/simple; bh=l05utgodRzsXTvNxJ3dXG/0QWp6nva1etPLXCc0yJxw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=MR7aeLYfoCaIYu0/6An4BZG/TzmeCw/N/uv0MJNZxYR7wGhZzf7pN6PC/rhknWAVwd0jPU0gx2u1eVVldUzgOf9HvG1xEOAAemn/Hb3Vgzuc13va7oAvNTv9ivodk+cp3z50wI5UIs25geMqd5NcpHJiPeNNqo7uFFiyBWln574= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=SQUTGzo0; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="SQUTGzo0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DA3461F000FF; Sat, 12 Sep 2026 11:54:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789214060; bh=HRYUPWUMvDFQC48+fzkGer9QL3fg9m7StUfGQ0isxfQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=SQUTGzo0hR0K24IFG1Qe682tXPudDWkW+905iSYqRaytiC7KZqWxhpQD9+LngQJc8 qZwhe5i/BWm59KG47FYG7WWn5QaE8yVYurQ3zSEtuA9+uGZ7YxkkbF6D54ql87Sxv2 omjHl2ogfGJiir73ufG3c8s50NsJiNcqZSuzaiHs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Hao-Qun Huang , Chao Yu , Jaegeuk Kim Subject: [PATCH 6.12 0249/1376] f2fs: reject overlapping move range after len expansion Date: Sat, 12 Sep 2026 08:44:35 +0200 Message-ID: <20260912065613.091551900@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065607.535295758@linuxfoundation.org> References: <20260912065607.535295758@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Hao-Qun Huang commit 28c1ef094e7c86977d9bf570dc0362fc54e36437 upstream. F2FS_IOC_MOVE_RANGE treats a zero length as a request to move data from pos_in to EOF. However, the same-file overlap check runs before that expansion, so a request with len == 0 bypasses the overlap rejection added for same-file moves. For example, with a four-block file, moving from block 0 to block 1 with len == 0 is accepted by the old check because pos_in + len is still pos_in at that point. The code then expands len to cover the rest of the file and calls __exchange_data_block() on overlapping source and destination ranges in the same inode, which is the data-corruption case the overlap check was meant to reject. Move the overlap check after the source range has been validated and len == 0 has been expanded, so it sees the effective length. This is a no-op for non-zero len (the value is unchanged there) and keeps the existing early return for identical positions. Fixes: d95fd91c1ac1 ("f2fs: exclude special cases for f2fs_move_file_range") Cc: stable@vger.kernel.org Assisted-by: Claude:claude-fable-5 Signed-off-by: Hao-Qun Huang Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Greg Kroah-Hartman --- fs/f2fs/file.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -3053,8 +3053,6 @@ static int f2fs_move_file_range(struct f if (src == dst) { if (pos_in == pos_out) return 0; - if (pos_out > pos_in && pos_out < pos_in + len) - return -EINVAL; } inode_lock(src); @@ -3080,6 +3078,8 @@ static int f2fs_move_file_range(struct f goto out_unlock; if (len == 0) olen = len = src->i_size - pos_in; + if (src == dst && pos_out > pos_in && pos_out < pos_in + len) + goto out_unlock; if (pos_in + len == src->i_size) len = ALIGN(src->i_size, F2FS_BLKSIZE) - pos_in; if (len == 0) {