ksmbd: validate normalized name response length

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FILE_NORMALIZED_NAME_INFORMATION converts the open file path to UTF-16.
smb2_allocate_rsp_buf() leaves these responses in the 448-byte small
buffer, and get_file_normalized_name_info() converts the path without
checking the remaining space.

An authenticated client can query a long path and make
smbConvertToUTF16() write beyond work->response_buf.

Use the large response buffer for normalized-name queries. Before
conversion, verify that the response has room for the worst-case UTF-16
output and its terminator.

Fixes: 10aeff72ab ("ksmbd: support normalized name information")
Assisted-by: Antiproof:GPT-5.6-Sol
Signed-off-by: Alon Shakevsky <shakevsky@berkeley.edu>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

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Alon Shakevsky 2026-08-29 06:27:46 +00:00 • committed by Namjae Jeon

parent a506290f59

commit ba9572bc43

1 changed files with 11 additions and 2 deletions

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fs/smb/server/smb2pdu.c

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