linux-kernel - [PATCH 5.6 141/254] CIFS: check new file size when extending file by fallocate

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Date:   Thu, 16 Apr 2020 15:23:50 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ronnie Sahlberg <lsahlber@...hat.com>,
        Murphy Zhou <jencce.kernel@...il.com>,
        Steve French <stfrench@...rosoft.com>
Subject: [PATCH 5.6 141/254] CIFS: check new file size when extending file by fallocate

From: Murphy Zhou <jencce.kernel@...il.com>

commit ef4a632ccc1c7d3fb71a5baae85b79af08b7f94b upstream.

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@...hat.com>
Signed-off-by: Murphy Zhou <jencce.kernel@...il.com>
Signed-off-by: Steve French <stfrench@...rosoft.com>
CC: Stable <stable@...r.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/cifs/smb2ops.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -3248,6 +3248,10 @@ static long smb3_simple_falloc(struct fi
 	 * 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);