Linux-NFS Archive on lore.kernel.org
 help / color / Atom feed
From: Guenter Roeck <linux@roeck-us.net>
To: Aditya Pakki <pakki001@umn.edu>
Cc: "J. Bruce Fields" <bfields@fieldses.org>,
	Chuck Lever <chuck.lever@oracle.com>,
	Trond Myklebust <trond.myklebust@hammerspace.com>,
	Anna Schumaker <anna.schumaker@netapp.com>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Dave Wysochanski <dwysocha@redhat.com>,
	linux-nfs@vger.kernel.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] SUNRPC: Add a check for gss_release_msg
Date: Wed, 21 Apr 2021 15:52:40 -0700
Message-ID: <20210421225240.GA117423@roeck-us.net> (raw)
In-Reply-To: <20210407001658.2208535-1-pakki001@umn.edu>

On Tue, Apr 06, 2021 at 07:16:56PM -0500, Aditya Pakki wrote:
> In gss_pipe_destroy_msg(), in case of error in msg, gss_release_msg
> deletes gss_msg. The patch adds a check to avoid a potential double
> free.
> 
> Signed-off-by: Aditya Pakki <pakki001@umn.edu>
> ---
>  net/sunrpc/auth_gss/auth_gss.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
> index 5f42aa5fc612..eb52eebb3923 100644
> --- a/net/sunrpc/auth_gss/auth_gss.c
> +++ b/net/sunrpc/auth_gss/auth_gss.c
> @@ -848,7 +848,8 @@ gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
>  			warn_gssd();
>  		gss_release_msg(gss_msg);
>  	}
> -	gss_release_msg(gss_msg);
> +	if (gss_msg)
> +		gss_release_msg(gss_msg);

I know I am adding to the noise here, but it has to be said:
gss_msg is assigned with
	struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg);
and thus never NULL.

Guenter

>  }
>  
>  static void gss_pipe_dentry_destroy(struct dentry *dir,
> -- 
> 2.25.1
> 

  parent reply index

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-07  0:16 Aditya Pakki
2021-04-07 15:34 ` J. Bruce Fields
2021-04-08 15:01 ` Trond Myklebust
2021-04-08 15:24   ` Olga Kornievskaia
2021-04-08 16:02     ` Trond Myklebust
2021-04-20  7:15 ` Greg KH
2021-04-20 17:10   ` J. Bruce Fields
2021-04-21  5:10     ` Leon Romanovsky
2021-04-21  5:43       ` Greg KH
2021-04-21  6:08         ` Leon Romanovsky
     [not found]         ` <CA+EnHHSw4X+ubOUNYP2zXNpu70G74NN1Sct2Zin6pRgq--TqhA@mail.gmail.com>
2021-04-21  8:15           ` Greg KH
2021-04-21 10:07         ` Sudip Mukherjee
2021-04-21 10:21           ` Greg KH
2021-04-21 11:58             ` Shelat, Abhi
2021-04-21 12:08               ` Greg KH
2021-04-21 12:19               ` Leon Romanovsky
2021-04-21 13:11                 ` Trond Myklebust
2021-04-21 13:20                   ` Leon Romanovsky
2021-04-21 13:42                     ` Steven Rostedt
2021-04-21 13:21                   ` gregkh
2021-04-21 13:34                     ` Leon Romanovsky
2021-04-21 13:50                       ` gregkh
2021-04-21 14:12                         ` Leon Romanovsky
2021-04-21 18:50                         ` Alexander Grund
2021-04-21 13:37               ` J. Bruce Fields
2021-04-21 13:49                 ` Leon Romanovsky
2021-04-21 13:56                   ` J. Bruce Fields
2021-04-22 19:39                     ` J. Bruce Fields
2021-04-23 17:25                       ` Leon Romanovsky
2021-04-23 18:07                         ` J. Bruce Fields
2021-04-23 19:29                           ` Leon Romanovsky
2021-04-23 21:48                             ` J. Bruce Fields
2021-04-24  7:21                               ` Leon Romanovsky
2021-04-24 18:34                               ` Al Viro
2021-04-24 21:34                                 ` J. Bruce Fields
2021-04-25  0:41                                   ` Theodore Ts'o
2021-04-25  6:29                                     ` Greg KH
     [not found]                                       ` <20210426133605.GD21222@fieldses.org>
2021-04-26 13:47                                         ` J. Bruce Fields
2021-04-22  8:10             ` Sudip Mukherjee
2021-04-22  8:27               ` Greg KH
2021-04-21 12:51       ` Anna Schumaker
2021-04-21 14:15         ` Leon Romanovsky
2021-04-21 15:48           ` Theodore Ts'o
2021-04-21 17:34             ` Mike Rapoport
2021-04-22  3:57               ` Leon Romanovsky
2021-04-21 22:52 ` Guenter Roeck [this message]
     [not found] <CAHr+ZK-ayy2vku9ovuSB4egtOxrPEKxCdVQN3nFqMK07+K5_8g@mail.gmail.com>
2021-04-21 19:49 ` Theodore Ts'o
2021-04-22  7:50   ` Eric Biggers
2021-04-21 20:27 Weikeng Chen

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210421225240.GA117423@roeck-us.net \
    --to=linux@roeck-us.net \
    --cc=anna.schumaker@netapp.com \
    --cc=bfields@fieldses.org \
    --cc=chuck.lever@oracle.com \
    --cc=davem@davemloft.net \
    --cc=dwysocha@redhat.com \
    --cc=kuba@kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-nfs@vger.kernel.org \
    --cc=netdev@vger.kernel.org \
    --cc=pakki001@umn.edu \
    --cc=trond.myklebust@hammerspace.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-NFS Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-nfs/0 linux-nfs/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-nfs linux-nfs/ https://lore.kernel.org/linux-nfs \
		linux-nfs@vger.kernel.org
	public-inbox-index linux-nfs

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-nfs


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git