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 EE9372D0C94; Sat, 12 Sep 2026 14:06:57 +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=1789222019; cv=none; b=ePnkd49y8CgX+AmELHyYOpWrnLkL4rmohQPdY1XCfX81oS6rUvGpTCsYG56k46e4keQEyNfKA99sdnbY31KvZ6vRjY84R7qK88ugF/PY1LD/aJ1wWbouteWpDA3uIVpytHtJUk+CacdHMuJHn2cwEeDZSYpqLM24jIir5o9ki00= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789222019; c=relaxed/simple; bh=WPHcO5Rb12Jr55fu6/9hlmbBeU24R0ltZUfZTxzlKRg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=OWEk/1IkGQMa6XDLoXjJPmK5tmwJrociKGzuDcY5+VKsms1RhsooY+ZX74e2VP6G4GkC3DdbwfzW4qA2YKX90kGu+xBrWagD/ppmDL0XGSEOYF4Od4eT7EmA8J3dr7f2TrgWTL+Afi5J4O/DIjilo6PpJSVt3dTBxbc7OFzbjUQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=MRiDdh8/; 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="MRiDdh8/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B2A4E1F000FF; Sat, 12 Sep 2026 14:06:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789222017; bh=KaS5gHef/z9Vwyyh/bmpOY32PQxcXeHXnGnNAOuzppQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=MRiDdh8/d8EbeOyTv4pmWLu5ygm7c+OkjKKd4Kyz9vS7+JTVC1D05g30r/IzpT5oq 3TGHePxso1aWcJ8pmGA+tYwCbCnbRW/sA/oIFAE2si4G6bq6sqoilSJr4kn6iGBVEM pMqHiMG4wy8IdGz25llyJHbq+htVtK/QF9OOVQrs= 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 6.6 0502/1424] f2fs: reject overlapping move range after len expansion Date: Sat, 12 Sep 2026 08:48:54 +0200 Message-ID: <20260912065618.532275871@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065607.279695368@linuxfoundation.org> References: <20260912065607.279695368@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 6.6-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 @@ -3018,8 +3018,6 @@ 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); @@ -3045,6 +3043,8 @@ 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) {