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ksmbd: fix partial normalized name responses

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Windows may request FILE_NORMALIZED_NAME_INFORMATION with an output
buffer that only fits the fixed portion of the variable-length response.
Treat the fixed portion as FILE_NORMALIZED_NAME_INFORMATION_SIZE so ksmbd
returns STATUS_BUFFER_OVERFLOW instead of STATUS_INFO_LENGTH_MISMATCH.

This avoids rejecting valid partial normalized-name responses.

Fixes: 6b8b79226b ("ksmbd: fix partial file information responses")
Reported-by: Mobin Aydinfar <mobin@mobintestserver.ir>
Reviewed-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Namjae Jeon 2026-09-09 09:58:22 +09:00
parent d7fd1f9860
commit f4fafaf021
2 changed files with 4 additions and 0 deletions
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3
fs/smb/server/smb2pdu.c
View File

@ -7312,6 +7312,9 @@ static int smb2_get_info_file(struct ksmbd_work *work,
case FILE_ALTERNATE_NAME_INFORMATION:
fixed_len = FILE_ALTERNATE_NAME_INFORMATION_SIZE;
break;
case FILE_NORMALIZED_NAME_INFORMATION:
fixed_len = FILE_NORMALIZED_NAME_INFORMATION_SIZE;
break;
case FILE_STREAM_INFORMATION:
fixed_len = FILE_STREAM_INFORMATION_SIZE;
break;

1
fs/smb/server/smb2pdu.h
View File

@ -212,6 +212,7 @@ struct file_sparse {
#define FILE_ALLOCATION_INFORMATION_SIZE 19
#define FILE_END_OF_FILE_INFORMATION_SIZE 20
#define FILE_ALTERNATE_NAME_INFORMATION_SIZE 8
#define FILE_NORMALIZED_NAME_INFORMATION_SIZE 8
#define FILE_STREAM_INFORMATION_SIZE 32
#define FILE_PIPE_INFORMATION_SIZE 23
#define FILE_PIPE_LOCAL_INFORMATION_SIZE 24