Re: [regression 6.1.80+] "CIFS: VFS: directory entry name would overflow frame end of buf" and invisible files under certain conditions and at least with noserverino mount option

[Paulo Alcantara <pc@manguebit.com>]

Hi Salvatore,

Salvatore Bonaccorso <carnil@debian.org> writes:

> In Debian we got two reports of cifs mounts not functioning, hiding
> certain files. The two reports are:
>
> https://bugs.debian.org/1069102
> https://bugs.debian.org/1069092
>
> On those cases kernel logs error
>
> [   23.225952] CIFS: VFS: directory entry name would overflow frame end of buf 00000000a44b272c

I couldn't reproduce it.  Does the following fix your issue:

diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c
index 4c1231496a72..3ee35430595e 100644
--- a/fs/smb/client/smb2pdu.c
+++ b/fs/smb/client/smb2pdu.c
@@ -5083,7 +5083,7 @@ smb2_parse_query_directory(struct cifs_tcon *tcon,
 		info_buf_size = sizeof(struct smb2_posix_info);
 		break;
 	case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
-		info_buf_size = sizeof(FILE_FULL_DIRECTORY_INFO);
+		info_buf_size = sizeof(FILE_FULL_DIRECTORY_INFO) - 1;
 		break;
 	default:
 		cifs_tcon_dbg(VFS, "info level %u isn't supported\n",

If not, please provide network trace and verbose logs.

Thanks.