[PATCH net 7/7] net/handshake: Verify file-reference balance in submit paths

[Hannes Reinecke]

On 5/18/26 20:24, Chuck Lever wrote:
> From: Chuck Lever <chuck.lever at oracle.com>
> 
> The new file-reference contract on struct handshake_req is silently
> breakable: a missing get_file() at submit or a missing fput() on an
> error path leaves the file leaked but does not crash the test, so
> the existing absence-of-crash checks pass either way.
> 
> Snapshot file_count(filp) before each handshake_req_submit() in
> the submit-success, EAGAIN, EBUSY, and cancel tests, and assert
> the expected balance after submit and again after cancel. The
> already-completed cancel test also asserts the post-complete
> balance, which pins down that handshake_complete() drops the
> reference and that the subsequent cancel does not double-fput.
> The destroy test gets the same treatment before __fput_sync(),
> which double-checks that cancel's fput() ran and the only
> remaining reference is the one sock_alloc_file() established.
> 
> Signed-off-by: Chuck Lever <chuck.lever at oracle.com>
> ---
>   net/handshake/handshake-test.c | 28 ++++++++++++++++++++++++++++
>   1 file changed, 28 insertions(+)
> 
One wonders why this is not part of the kunit test suite.
But that's probably neither here nor there.

So:

Reviewed-by: Hannes Reinecke <hare at kernel.org>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
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