linux-kernel - cifs: suscpected double free in cifs_oplock

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Message-ID: <TYCP286MB118867BCD206596ED6C8971C8A8E9@TYCP286MB1188.JPNP286.PROD.OUTLOOK.COM>
Date:   Fri, 5 Nov 2021 14:19:25 +0000
From:   YE Chengfeng <cyeaa@...nect.ust.hk>
To:     "sfrench@...ba.org" <sfrench@...ba.org>
CC:     "linux-cifs@...r.kernel.org" <linux-cifs@...r.kernel.org>,
        "samba-technical@...ts.samba.org" <samba-technical@...ts.samba.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: cifs: suscpected double free in cifs_oplock_break on error

Hi,

We notice that _cifsFileInfo_put() is called twice for cfile follow branch at #line 4874. Follow _cifsFileInfo_put->_cifsFileInfo_put->cifsFileInfo_put_final, cfile will be freed finally, so it calling this function on the same variable at twice looks like a double free issue. Would you like to have a look at it? We would like to provide a patch after confirmation.

https://github.com/torvalds/linux/blob/master/fs/cifs/file.c#L4874

Best regards,
Chengfeng