From: Pablo Neira Ayuso <pablo@netfilter.org>
To: Wenwen Wang <wang6495@umn.edu>
Cc: Wenwen Wang <wenwen@cs.uga.edu>,
Jozsef Kadlecsik <kadlec@netfilter.org>,
Florian Westphal <fw@strlen.de>,
Roopa Prabhu <roopa@cumulusnetworks.com>,
Nikolay Aleksandrov <nikolay@cumulusnetworks.com>,
"David S. Miller" <davem@davemloft.net>,
"open list:NETFILTER" <netfilter-devel@vger.kernel.org>,
"open list:NETFILTER" <coreteam@netfilter.org>,
"moderated list:ETHERNET BRIDGE"
<bridge@lists.linux-foundation.org>,
"open list:ETHERNET BRIDGE" <netdev@vger.kernel.org>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] netfilter: ebtables: compat: fix a memory leak bug
Date: Sun, 21 Jul 2019 20:59:45 +0200 [thread overview]
Message-ID: <20190721185945.76vsrm6ruge64das@salvia> (raw)
In-Reply-To: <1563625366-3602-1-git-send-email-wang6495@umn.edu>
On Sat, Jul 20, 2019 at 07:22:45AM -0500, Wenwen Wang wrote:
> From: Wenwen Wang <wenwen@cs.uga.edu>
>
> In compat_do_replace(), a temporary buffer is allocated through vmalloc()
> to hold entries copied from the user space. The buffer address is firstly
> saved to 'newinfo->entries', and later on assigned to 'entries_tmp'. Then
> the entries in this temporary buffer is copied to the internal kernel
> structure through compat_copy_entries(). If this copy process fails,
> compat_do_replace() should be terminated. However, the allocated temporary
> buffer is not freed on this path, leading to a memory leak.
>
> To fix the bug, free the buffer before returning from compat_do_replace().
Applied, thanks.
next prev parent reply other threads:[~2019-07-21 18:59 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-20 12:22 [PATCH] netfilter: ebtables: compat: fix a memory leak bug Wenwen Wang
2019-07-21 0:26 ` Florian Westphal
2019-07-21 18:59 ` Pablo Neira Ayuso [this message]
2019-07-22 12:32 ` Liam R. Howlett
2019-07-22 12:53 ` Wenwen Wang
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