ksmbd: reject blocking compound lock requests

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Clients set SMB2_LOCKFLAG_FAIL_IMMEDIATELY when a LOCK request contains
multiple lock elements, and servers reject requests that omit it.
Accepting such a request can leave earlier elements locked while a later
element waits asynchronously, enabling prolonged partial lock ownership
and avoidable deadlocks.

Return STATUS_INVALID_PARAMETER before processing any element when a
multi-element lock request contains a blocking lock. Unlock arrays remain
unaffected.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

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Namjae Jeon 2026-07-29 21:26:26 +09:00

parent 054bcca4cd

commit 16a7f7c2ec

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fs/smb/server/smb2pdu.c

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