ksmbd: close accepted socket when per-IP limit rejects connection

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commit 98a5fd31cb upstream.

When the per-IP connection limit is exceeded in ksmbd_kthread_fn(),
the code sets ret = -EAGAIN and continues the accept loop without
closing the just-accepted socket. That leaks one socket per rejected
attempt from a single IP and enables a trivial remote DoS.

Release client_sk before continuing.

This bug was found with ZeroPath.

Cc: stable@vger.kernel.org
Signed-off-by: Joshua Rogers <linux@joshua.hu>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Joshua Rogers 2025-11-08 22:59:23 +08:00 • committed by Greg Kroah-Hartman

parent 592b3b203a

commit 4587a7826b

1 changed files with 4 additions and 1 deletions

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fs/smb/server/transport_tcp.c

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