The patch below does not apply to the 5.5-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From ef4a632ccc1c7d3fb71a5baae85b79af08b7f94b Mon Sep 17 00:00:00 2001

From: Murphy Zhou jencce.kernel@gmail.com Date: Wed, 18 Mar 2020 20:43:38 +0800 Subject: [PATCH] CIFS: check new file size when extending file by fallocate

xfstests generic/228 checks if fallocate respect RLIMIT_FSIZE. After fallocate mode 0 extending enabled, we can hit this failure. Fix this by check the new file size with vfs helper, return error if file size is larger then RLIMIT_FSIZE(ulimit -f).

This patch has been tested by LTP/xfstests aginst samba and Windows server.

Acked-by: Ronnie Sahlberg lsahlber@redhat.com Signed-off-by: Murphy Zhou jencce.kernel@gmail.com Signed-off-by: Steve French stfrench@microsoft.com CC: Stable stable@vger.kernel.org

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index b0759c8aa6f5..9c9258fc8756 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -3255,6 +3255,10 @@ static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon, * Extending the file */ if ((keep_size == false) && i_size_read(inode) < off + len) { + rc = inode_newsize_ok(inode, off + len); + if (rc) + goto out; + if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0) smb2_set_sparse(xid, tcon, cfile, inode, false);