On Mon, Oct 6, 2025 at 4:16 PM Hannes Reinecke [off-list ref] wrote:

On 10/3/25 06:31, alistair23@gmail.com wrote:

quoted

From: Alistair Francis <redacted>

To avoid future handshake_req_hash_add() calls failing with EEXIST when
performing a KeyUpdate let's make sure the old request is destructed
as part of the completion.

Signed-off-by: Alistair Francis <redacted>
---
v3:
  - New patch

  net/handshake/request.c | 2 ++
  1 file changed, 2 insertions(+)

diff --git a/net/handshake/request.c b/net/handshake/request.c
index 0d1c91c80478..194725a8aaca 100644
--- a/net/handshake/request.c
+++ b/net/handshake/request.c

@@ -311,6 +311,8 @@ void handshake_complete(struct handshake_req *req, unsigned int status,
              /* Handshake request is no longer pending */
              sock_put(sk);
      }
+
+     handshake_sk_destruct_req(sk);
  }
  EXPORT_SYMBOL_IF_KUNIT(handshake_complete);

Curious.
Why do we need it now? We had been happily using the handshake mechanism
for quite some time now, so who had been destroying the request without
this patch?

Until now a handshake would only be destroyed on a failure or when a
sock is freed (via the sk_destruct function pointer).
handshake_complete() is only called on errors, not a successful
handshake so it doesn't remove the request.

Note that destroying is mostly just removing the entry from the hash
table with rhashtable_remove_fast(). Which is what we need to be able
to submit it again.

Alistair

Cheers,

Hannes
--
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@suse.de                                +49 911 74053 688
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