netdev - [PATCH net-next 0/6] sctp: fix a plenty of flexible-array-nested warnings

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Date:   Wed, 19 Apr 2023 11:16:27 -0400
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Subject: [PATCH net-next 0/6] sctp: fix a plenty of flexible-array-nested warnings

Paolo noticed a compile warning in SCTP,

../net/sctp/stream_sched_fc.c: note: in included file (through ../include/net/sctp/sctp.h):
../include/net/sctp/structs.h:335:41: warning: array of flexible structures

But not only this, there are actually quite a lot of such warnings in
some SCTP structs. This patchset fixes most of warnings by deleting
these nested flexible array members.

After this patchset, there are still some warnings left:

  # make C=2 CF="-Wflexible-array-nested" M=./net/sctp/
  ./include/net/sctp/structs.h:1145:41: warning: nested flexible array
  ./include/uapi/linux/sctp.h:641:34: warning: nested flexible array
  ./include/uapi/linux/sctp.h:643:34: warning: nested flexible array
  ./include/uapi/linux/sctp.h:644:33: warning: nested flexible array
  ./include/uapi/linux/sctp.h:650:40: warning: nested flexible array
  ./include/uapi/linux/sctp.h:653:39: warning: nested flexible array

the 1st is caused by __data[] in struct ip_options, not in SCTP;
the others are in uapi, and we should not touch them.

Note that instead of completely deleting it, we just leave it as a
comment in the struct, signalling to the reader that we do expect
such variable parameters over there, as Marcelo suggested.

Xin Long (6):
  sctp: delete the nested flexible array params
  sctp: delete the nested flexible array skip
  sctp: delete the nested flexible array variable
  sctp: delete the nested flexible array peer_init
  sctp: delete the nested flexible array hmac
  sctp: delete the nested flexible array payload

 include/linux/sctp.h         | 18 +++++++++---------
 include/net/sctp/sctp.h      | 12 ++++++------
 include/net/sctp/structs.h   |  2 +-
 net/sctp/associola.c         |  5 +++--
 net/sctp/auth.c              |  2 +-
 net/sctp/input.c             |  2 +-
 net/sctp/outqueue.c          | 11 +++++++----
 net/sctp/sm_make_chunk.c     | 22 +++++++++++-----------
 net/sctp/sm_sideeffect.c     |  3 +--
 net/sctp/sm_statefuns.c      | 14 ++++++--------
 net/sctp/stream.c            |  2 +-
 net/sctp/stream_interleave.c |  4 ++--
 12 files changed, 49 insertions(+), 48 deletions(-)

-- 
2.39.1