[PATCH net v4 0/2] sctp: re-point retained control chunks on association migration

This series fixes ownership of retained SCTP control chunks during socket
migration. Patch 1 carries David Lee's shared-key prerequisite.

Changes since v3 [1], following Xin Long's review:
 - Add David Lee's and the forwarding submitter's sign-offs to patch 1.
 - Restore sctp_process_tx_chunk() to skip duplicate visits.
 - Preserve a control chunk's existing shared key across migration.

[1] https://lore.kernel.org/netdev/20260926100359.78731-1-juny24602@gmail.com/ (local)

David Lee (1):
  sctp: hold shkey across socket migration

Jun Yang (1):
  sctp: re-point retained control chunks on association migration

 include/net/sctp/sm.h    |  1 +
 net/sctp/sm_make_chunk.c |  5 +++--
 net/sctp/socket.c        | 57 +++++++++++++++++++++++++++++++++++++++---------
 3 files changed, 51 insertions(+), 12 deletions(-)

base-commit: a7bfaba4823e3c165bb2004c74eff7c096672bc7