From patchwork Mon Jun 17 22:18:13 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Barry Song <21cnbao@gmail.com> X-Patchwork-Id: 13701490 Received: from mail-pl1-f170.google.com (mail-pl1-f170.google.com [209.85.214.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 08139225AE; Mon, 17 Jun 2024 22:18:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.170 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718662711; cv=none; b=HP1Y0fUDlcBt7zojfP72WxZY4KNg3Na8S1q9b2vEFH3JlQ+MBW/LG6eDd/i/Ipy9Seh2MNZUbbJdtqJGmRkA4Sg+duwKQV3ns8sYUmuWPiGdBo7F+wMrs7dRbRM6awjcem2Bq3fdywLIChVmUiyEJ7yeQklPHDkEHuMv+iLzslQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718662711; c=relaxed/simple; bh=s5uDqeDxkxeHEEuY3eafRrrftRpfKweQTcQHgylYD6s=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=casi4vwYhJKvCslzobp9F/F7bf2io3ocz1w+scS6twyTX7mfO1pBYy8uKBoIDf2Vf4NG2YmdXxZxjlM8FpuNBTa46nIkDaN8v1nO440ydRO2PbrqkH7EV4gdMvYkAgpFwt74VZDfpoyebtAHrKid74XS0sp/0FZBy65sSmSskSA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=CNrRdJ/5; arc=none smtp.client-ip=209.85.214.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="CNrRdJ/5" Received: by mail-pl1-f170.google.com with SMTP id d9443c01a7336-1f44b5b9de6so37901405ad.3; Mon, 17 Jun 2024 15:18:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1718662709; x=1719267509; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=WgpPhgSpGnuAzgyitgZqw4rkMCpmuPP+oURq7WdfToI=; b=CNrRdJ/54B2qiaazcIvrSUddnbcErfEM1GpXM16qKUYw6fiWuU5PtqNXSUL4rS8DkY fZBXTE3pZlNnjE3lj7YkSerZTlKGfby5X2jbxud1C3PIfT2zfNsQhcfT0dFwJ3SjHGKZ HLfXBLO9QFmSVt2XXNjvjnhMmU0+qKlIaWt1C3EWdZbkPBy7O2nCkYHejWpduLDooe1J ifakLn+fYZbBwq0MCbFB108KvCEb3ug/iDWsgNsGPndDPnKRqcOJpd1nSxAOB4PLtfPA 4HKasGG7IHwTusuHQvYW6zNgkpQyLFRrFb+cuVdRy+gnkLrJrJfGPVfltv1fvZZMCOio j7yw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1718662709; x=1719267509; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=WgpPhgSpGnuAzgyitgZqw4rkMCpmuPP+oURq7WdfToI=; b=ZSaWPA+QoOuuHmNQ1tNAcq+E2huoyVrzAsAXJ/kguBfA0tmdNBnYBgkpRxk1n9i3eZ bgeuxATCpYAD22YokMuThf9PiWjPckg/zeIiWnVZq1J4AUi2xkL1plQnpWCnvpSZYRtt d17hscDk5zzu4cOPMmjKOqPZUGDkhJSVOLx5PGXVw3VDND3VwxP1iM9AHbiOrE8JHU36 Yzs1d3DFWvAaFvKRekJmR9IlBKD1/rxt2fu2PizIaYkqSrra1Q0ooAbXOdYPTUq2atcF 7PVwWrzFav64Y7BL9H7r7/2c25QwZOCZYdZjtcaUJIcgdf3XJQ7OLLd6g+6QU74ZAI7s n5mw== X-Forwarded-Encrypted: i=1; AJvYcCWnJo65uUdKhtEaXtr5VFlOn42IHXrfSgzROGJynz1t/F7Tpazc7GUSHt1a9fChBCrKBBZtq05vmvi854M2YR0t8Ls5fw/w/VhdA0jrlK9j6wOZvjxqnGdDLoC9yqKGSTID X-Gm-Message-State: AOJu0YwKFzznflmEDw6rWo/vY1UPTnQd82MDORdYSU53LIsA5P0e+pU3 HMd/qg21aV1Feh9uDvi2Tnsd8iOV+MJfK7QhroTmVBAWdcopHxbu X-Google-Smtp-Source: AGHT+IFXZ4im6gENWa2acZ8xmU8vtV5qgUZB3zXzpkFv4olxojNSGSoqXbVj1YMNI4OecFpSuz2idg== X-Received: by 2002:a17:903:2348:b0:1f8:67e4:3977 with SMTP id d9443c01a7336-1f867e453b5mr102032975ad.34.1718662709286; Mon, 17 Jun 2024 15:18:29 -0700 (PDT) Received: from localhost.localdomain ([2407:7000:8942:5500:aaa1:59ff:fe57:eb97]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1f855ee6e7esm83944365ad.139.2024.06.17.15.18.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 Jun 2024 15:18:28 -0700 (PDT) From: Barry Song <21cnbao@gmail.com> To: akpm@linux-foundation.org, linux-mm@kvack.org, linux-nfs@vger.kernel.org Cc: linux-cifs@vger.kernel.org, sfrench@samba.org, Barry Song , Christoph Hellwig , NeilBrown , Anna Schumaker , Trond Myklebust , Chuanhua Han , Ryan Roberts , Chris Li , "Huang, Ying" , Jeff Layton , stable@vger.kernel.org Subject: [PATCH] cifs: fix the incorrect assertion in cifs_swap_rw() Date: Tue, 18 Jun 2024 10:18:13 +1200 Message-Id: <20240617221813.58244-1-21cnbao@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-cifs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Barry Song Since commit 2282679fb20b ("mm: submit multipage write for SWP_FS_OPS swap-space"), we can plug multiple pages then unplug them all together. That means iov_iter_count(iter) could be way bigger than PAGE_SIZE, it actually equals the size of iov_iter_npages(iter, INT_MAX). Note this issue has nothing to do with large folios as we don't support THP_SWPOUT to non-block devices. Fixes: 2282679fb20b ("mm: submit multipage write for SWP_FS_OPS swap-space") Reported-by: Christoph Hellwig Closes: https://lore.kernel.org/linux-mm/20240614100329.1203579-1-hch@lst.de/ Cc: NeilBrown Cc: Anna Schumaker Cc: Steve French Cc: Trond Myklebust Cc: Chuanhua Han Cc: Ryan Roberts Cc: Chris Li Cc: "Huang, Ying" Cc: Jeff Layton Cc: Signed-off-by: Barry Song --- fs/smb/client/file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/smb/client/file.c b/fs/smb/client/file.c index 9d5c2440abfc..2f11f138c57d 100644 --- a/fs/smb/client/file.c +++ b/fs/smb/client/file.c @@ -3200,7 +3200,7 @@ static int cifs_swap_rw(struct kiocb *iocb, struct iov_iter *iter) { ssize_t ret; - WARN_ON_ONCE(iov_iter_count(iter) != PAGE_SIZE); + WARN_ON_ONCE(iov_iter_count(iter) != iov_iter_npages(iter, INT_MAX) * PAGE_SIZE); if (iov_iter_rw(iter) == READ) ret = netfs_unbuffered_read_iter_locked(iocb, iter);