ksmbd: transport_ipc: validate payload size before reading handle

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commit 6f40e50ceb upstream.

handle_response() dereferences the payload as a 4-byte handle without
verifying that the declared payload size is at least 4 bytes. A malformed
or truncated message from ksmbd.mountd can lead to a 4-byte read past the
declared payload size. Validate the size before dereferencing.

This is a minimal fix to guard the initial handle read.

Fixes: 0626e6641f ("cifsd: add server handler for central processing and tranport layers")
Cc: stable@vger.kernel.org
Reported-by: Qianchang Zhao <pioooooooooip@gmail.com>
Signed-off-by: Qianchang Zhao <pioooooooooip@gmail.com>
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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Qianchang Zhao 2025-10-22 15:27:47 +09:00 • committed by Greg Kroah-Hartman

parent 1caa8b999d

commit 867ffd9d67

1 changed files with 7 additions and 1 deletions

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fs/smb/server/transport_ipc.c

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