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build_compression_ctxt() is currently unreachable due to
conn.compress_algorithm remaining zero (SMB3_COMPRESS_NONE).
It appears to have been broken in a couple of subtle ways over the
years:
- prior to d6c9ad23b421 ("ksmbd: use the common definitions for
NEGOTIATE_PROTOCOL") smb2_compression_ctx.DataLength was set to 8,
which didn't account for the single CompressionAlgorithms flexible
array member.
- post d6c9ad23b421 smb2_compression_capabilities_context
CompressionAlgorithms is a three member array, while
CompressionAlgorithmCount is set to indicate only one member.
assemble_neg_contexts() ctxt_size is also incorrectly incremented by
sizeof(struct smb2_compression_capabilities_context) + 2, which
assumes one flexible array member.
Signed-off-by: David Disseldorp <ddiss@suse.de>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>