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From:   NeilBrown <neilb@suse.de>
To:     Andrew Morton <akpm@linux-foundation.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Jonathan Corbet <corbet@lwn.net>
Date:   Fri, 05 Feb 2021 11:36:30 +1100
Subject: [PATCH 0/3] Fix some seq_file users that were recently broken
Cc:     Xin Long <lucien.xin@gmail.com>, linux-kernel@vger.kernel.org,
        linux-doc@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Andy Lutomirski <luto@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Vlad Yasevich <vyasevich@gmail.com>,
        Neil Horman <nhorman@tuxdriver.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>,
        "David S. Miller" <davem@davemloft.net>,
        linux-sctp@vger.kernel.org, netdev@vger.kernel.org
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A recent change to seq_file broke some users which were using seq_file
in a non-"standard" way ...  though the "standard" isn't documented, so
they can be excused.  The result is a possible leak - of memory in one
case, of references to a 'transport' in the other.

These three patches:
 1/ document and explain the problem
 2/ fix the problem user in x86
 3/ fix the problem user in net/sctp

I suspect the patches should each go through the relevant subsystems,
but I'm including akpm as the original went through him.

Thanks,
NeilBrown

---

NeilBrown (3):
      seq_file: document how per-entry resources are managed.
      x86: fix seq_file iteration for pat/memtype.c
      net: fix iteration for sctp transport seq_files

 Documentation/filesystems/seq_file.rst |  6 ++++++
 arch/x86/mm/pat/memtype.c              |  4 ++--
 net/sctp/proc.c                        | 16 ++++++++++++----
 3 files changed, 20 insertions(+), 6 deletions(-)

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