diff options
| author | Steve French <stfrench@microsoft.com> | 2018-08-29 17:22:22 +0300 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2018-09-03 07:21:42 +0300 |
| commit | 25f2573512d7b38bca4c0878109db9600b8b711f (patch) | |
| tree | ff0569d29fa82637e82aad1af4c95e01ec87b1e3 /fs | |
| parent | 5e19697b56a64004e2d0ff1bb952ea05493c088f (diff) | |
| download | linux-25f2573512d7b38bca4c0878109db9600b8b711f.tar.xz | |
smb3: minor debugging clarifications in rfc1001 len processing
I ran into some cases where server was returning the wrong length
on frames but I couldn't easily match them to the command in the
network trace (or server logs) since I need the command and/or
multiplex id to find the offending SMB2/SMB3 command. Add these
two fields to the log message. In the case of padding too much
it may not be a problem in all cases but might have correlated
to a network disconnect case in some problems we have been
looking at. In the case of frame too short is even more important.
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/cifs/smb2misc.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/fs/cifs/smb2misc.c b/fs/cifs/smb2misc.c index db0453660ff6..6a9c47541c53 100644 --- a/fs/cifs/smb2misc.c +++ b/fs/cifs/smb2misc.c @@ -248,16 +248,20 @@ smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *srvr) * MacOS server pads after SMB2.1 write response with 3 bytes * of junk. Other servers match RFC1001 len to actual * SMB2/SMB3 frame length (header + smb2 response specific data) - * Some windows servers do too when compounding is used. - * Log the server error (once), but allow it and continue + * Some windows servers also pad up to 8 bytes when compounding. + * If pad is longer than eight bytes, log the server behavior + * (once), since may indicate a problem but allow it and continue * since the frame is parseable. */ if (clc_len < len) { - printk_once(KERN_WARNING - "SMB2 server sent bad RFC1001 len %d not %d\n", - len, clc_len); + pr_warn_once( + "srv rsp padded more than expected. Length %d not %d for cmd:%d mid:%llu\n", + len, clc_len, command, mid); return 0; } + pr_warn_once( + "srv rsp too short, len %d not %d. cmd:%d mid:%llu\n", + len, clc_len, command, mid); return 1; } |