From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 12F203A5E70 for ; Tue, 14 Apr 2026 08:20:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776154830; cv=none; b=lDav/UDbRJjkVz6QKSvspSsjOCAPZH8Tj5MkDRdAQpyRaFCRh4434fdqeFeo0Wxwt7yR9yFXAXBXVUs5bxZqVEk4ihqQeKevurocFC6GSp9CMychidCIvjDRzfPXa5Gk5yUKA0GXTtgyW08bt6oSxrYLygPq2myyhVWLCdeqE08= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776154830; c=relaxed/simple; bh=S62t+upgojIYhz1p6dALu+kyrentByS35lQhzLSLXbY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Td1jy2tbpDqLjEDgNdNLhfzb3DvaQboip5rmvSbbgazpTbCvTOG9/iYbu9PMFR3PXWiDVOq2yLSiQKuHbLXANzQ4QYe1zoZvYGR+ZZ8pEnjMineD0vXy0mX1yG9Q0apZJZKXQHiaOnRRrsr1lCDakAt+wqg0e+ceSDmyNFjtD5Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=Sjz5IEUl; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Sjz5IEUl" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1776154828; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=0M8NeyGOtxqcK9n3lFvZBV03uT/fzw4I/4MxBJJ99Zo=; b=Sjz5IEUlmecx5OQp0UYyyTJduTuBdtZPfrQQhirZJz2HkxxPBBv5o/Z2kn9mmzyLl+Oc+A lN0eM0yUpy4GeJkRW9JGA8Gzc+raKLxK34lcUxhmQehfvxMcyOg9ft0duclCj20+Ffdn1P pr0HJbqe8O9l5R2URKJWyiB87T9gq70= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-515-heacoSwaPWixRL0MJVs81g-1; Tue, 14 Apr 2026 04:20:23 -0400 X-MC-Unique: heacoSwaPWixRL0MJVs81g-1 X-Mimecast-MFC-AGG-ID: heacoSwaPWixRL0MJVs81g_1776154822 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 47AEC1955DAE; Tue, 14 Apr 2026 08:20:22 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.44.34.160]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id B0C241800451; Tue, 14 Apr 2026 08:20:18 +0000 (UTC) From: David Howells To: Christian Brauner Cc: David Howells , Paulo Alcantara , netfs@lists.linux.dev, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Paulo Alcantara , Xiaoli Feng , stable@vger.kernel.org Subject: [PATCH v2 2/7] netfs: fix error handling in netfs_extract_user_iter() Date: Tue, 14 Apr 2026 09:19:58 +0100 Message-ID: <20260414082004.3756080-3-dhowells@redhat.com> In-Reply-To: <20260414082004.3756080-1-dhowells@redhat.com> References: <20260414082004.3756080-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 From: Paulo Alcantara In netfs_extract_user_iter(), if iov_iter_extract_pages() failed to extract user pages, bail out on -ENOMEM, otherwise return the error code only if @npages == 0, allowing short DIO reads and writes to be issued. This fixes mmapstress02 from LTP tests against CIFS. Fixes: 85dd2c8ff368 ("netfs: Add a function to extract a UBUF or IOVEC into a BVEC iterator") Reported-by: Xiaoli Feng Signed-off-by: Paulo Alcantara (Red Hat) Signed-off-by: David Howells Cc: netfs@lists.linux.dev Cc: stable@vger.kernel.org Cc: linux-cifs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org --- fs/netfs/iterator.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/fs/netfs/iterator.c b/fs/netfs/iterator.c index 154a14bb2d7f..adca78747f23 100644 --- a/fs/netfs/iterator.c +++ b/fs/netfs/iterator.c @@ -22,7 +22,7 @@ * * Extract the page fragments from the given amount of the source iterator and * build up a second iterator that refers to all of those bits. This allows - * the original iterator to disposed of. + * the original iterator to be disposed of. * * @extraction_flags can have ITER_ALLOW_P2PDMA set to request peer-to-peer DMA be * allowed on the pages extracted. @@ -67,8 +67,8 @@ ssize_t netfs_extract_user_iter(struct iov_iter *orig, size_t orig_len, ret = iov_iter_extract_pages(orig, &pages, count, max_pages - npages, extraction_flags, &offset); - if (ret < 0) { - pr_err("Couldn't get user pages (rc=%zd)\n", ret); + if (unlikely(ret <= 0)) { + ret = ret ?: -EIO; break; } @@ -97,6 +97,13 @@ ssize_t netfs_extract_user_iter(struct iov_iter *orig, size_t orig_len, npages += cur_npages; } + if (ret < 0 && (ret == -ENOMEM || npages == 0)) { + for (i = 0; i < npages; i++) + unpin_user_page(bv[i].bv_page); + kvfree(bv); + return ret; + } + iov_iter_bvec(new, orig->data_source, bv, npages, orig_len - count); return npages; }