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 768D33F075F; Wed, 20 May 2026 15:02:55 +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=1779289376; cv=none; b=g9i5gxjl3JN4DmviQahWMqIy78KzyH2m25yvSvgjfHcbawN80D0XJgGkfp7D8yXWNJoFT/vFxBvMFhhrROE1XFfH+3s2owkO8RZgXli5itvMZEbibl4jtcs4YdmWa2uwMvNT6+b0ac73zs6YOnmwX4adiOZC8n1R0M4phUEO0gQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779289376; c=relaxed/simple; bh=l7UNYwvTcP8Gvl5RvIURP0Ib0JnZnzgYHrFikZYWQJo=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=PGyP93QgAjy+fD2u5woR9govC8HERiZ2Pfku2Xjb+JlWKTLBYHH6JErLqMfSXLVEH6Od7i6mYzH9Z4XVoxX8pX8Xa/uQudJpOhqIFVuQsBKuuav9wV9psEnHbPPsdi7cRbZzWV5b8leakyMB4mBwPMwZ8zqv7xJbwCdTVrHn0Zc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=MeF2Dh/X; 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="MeF2Dh/X" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9F9981F000E9; Wed, 20 May 2026 15:02:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1779289375; bh=r332MFDoTKHbbBzEBeT9rujy28Omj9FwKOguxRV4hk8=; h=Subject:To:Cc:From:Date; b=MeF2Dh/X0lgWYfq8n21s369OuYCOe5BZf/ENyEgTQqIB02pSUROHpbEX8lV26zal7 ZC0oR6paf+vLbmOFSRf14C7Y0y7kvXF7xLEjHJI+bExpLIiMn7QdnjfFhndF1QKR13 HlgFVI5JO9TwardWfOidbV8Jt3cYQrA0F3i7e/O4= Subject: Patch "netfs: fix error handling in netfs_extract_user_iter()" has been added to the 6.6-stable tree To: brauner@kernel.org,dhowells@redhat.com,gregkh@linuxfoundation.org,netfs@lists.linux.dev,pc@manguebit.org,xifeng@redhat.com Cc: From: Date: Wed, 20 May 2026 17:01:17 +0200 Message-ID: <2026052017-washboard-dangling-ff2e@gregkh> Precedence: bulk X-Mailing-List: netfs@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit X-stable: commit X-Patchwork-Hint: ignore This is a note to let you know that I've just added the patch titled netfs: fix error handling in netfs_extract_user_iter() to the 6.6-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: netfs-fix-error-handling-in-netfs_extract_user_iter.patch and it can be found in the queue-6.6 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >From 0aad5704c6b4d14007d4eab15883e8524e4310f4 Mon Sep 17 00:00:00 2001 From: Paulo Alcantara Date: Tue, 12 May 2026 13:33:46 +0100 Subject: netfs: fix error handling in netfs_extract_user_iter() From: Paulo Alcantara commit 0aad5704c6b4d14007d4eab15883e8524e4310f4 upstream. 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 Link: https://patch.msgid.link/20260512123404.719402-10-dhowells@redhat.com Cc: netfs@lists.linux.dev Cc: stable@vger.kernel.org Cc: linux-cifs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Signed-off-by: Christian Brauner Signed-off-by: Greg Kroah-Hartman --- fs/netfs/iterator.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) --- 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 i 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 i 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; } Patches currently in stable-queue which might be from pc@manguebit.org are queue-6.6/netfs-fix-error-handling-in-netfs_extract_user_iter.patch queue-6.6/smb-client-fix-oob-reads-parsing-symlink-error-respo.patch