From mboxrd@z Thu Jan 1 00:00:00 1970 From: "J. R. Okajima" Subject: Q: cifs, freeing volume_info->UNCip Date: Tue, 16 Aug 2011 08:22:17 +0900 Message-ID: <7087.1313450537@jrobl> Cc: linux-kernel@vger.kernel.org, kirk w To: smfrench@gmail.com, linux-cifs@vger.kernel.org Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-cifs.vger.kernel.org Hello, CIFS cleanup_volume_info_contents() looks like having a memory corruption problem. When UNCip is set to "&vol->UNC[2]" in cifs_parse_mount_options(), it should not be kfree()-ed in cleanup_volume_info_contents(). If it is correct and the code in mainline is not fixed yet, then here is a patch. diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index ccc1afa..e0ea721 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -2838,7 +2838,8 @@ cleanup_volume_info_contents(struct smb_vol *volume_info) kfree(volume_info->username); kzfree(volume_info->password); kfree(volume_info->UNC); - kfree(volume_info->UNCip); + if (volume_info->UNCip != volume_info->UNC + 2) + kfree(volume_info->UNCip); kfree(volume_info->domainname); kfree(volume_info->iocharset); kfree(volume_info->prepath); J. R. Okajima