ksmbd: validate session id and tree id in the compound request

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commit 5005bcb421 upstream.

This patch validate session id and tree id in compound request.
If first operation in the compound is SMB2 ECHO request, ksmbd bypass
session and tree validation. So work->sess and work->tcon could be NULL.
If secound request in the compound access work->sess or tcon, It cause
NULL pointer dereferecing error.

Cc: stable@vger.kernel.org
Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-21165
Signed-off-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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Namjae Jeon 2023-06-15 22:05:29 +09:00 • committed by Greg Kroah-Hartman

parent c86211159b

commit 854156d12c

2 changed files with 59 additions and 18 deletions

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33

fs/ksmbd/server.c

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44

fs/ksmbd/smb2pdu.c

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