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four small SMB3 fixes: one for stable, the others to address a more recent regression

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Merge tag '4.19-rc6-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6

Steve writes:
  "SMB3 fixes

   four small SMB3 fixes: one for stable, the others to address a more
   recent regression"

* tag '4.19-rc6-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  smb3: fix lease break problem introduced by compounding
  cifs: only wake the thread for the very last PDU in a compound
  cifs: add a warning if we try to to dequeue a deleted mid
  smb2: fix missing files in root share directory listing
This commit is contained in:
Greg Kroah-Hartman 2018-10-05 08:27:47 -07:00
commit 087f759a41
4 changed files with 31 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
fs/cifs/cifsglob.h
View File

@ -1553,6 +1553,7 @@ static inline void free_dfs_info_array(struct dfs_info3_param *param,
/* Flags */
#define MID_WAIT_CANCELLED 1 /* Cancelled while waiting for response */
#define MID_DELETED 2 /* Mid has been dequeued/deleted */
/* Types of response buffer returned from SendReceive2 */
#define CIFS_NO_BUFFER 0 /* Response buffer not returned */

13
fs/cifs/connect.c
View File

@ -659,7 +659,15 @@ dequeue_mid(struct mid_q_entry *mid, bool malformed)
mid->mid_state = MID_RESPONSE_RECEIVED;
else
mid->mid_state = MID_RESPONSE_MALFORMED;
list_del_init(&mid->qhead);
/*
* Trying to handle/dequeue a mid after the send_recv()
* function has finished processing it is a bug.
*/
if (mid->mid_flags & MID_DELETED)
printk_once(KERN_WARNING
"trying to dequeue a deleted mid\n");
else
list_del_init(&mid->qhead);
spin_unlock(&GlobalMid_Lock);
}
@ -938,8 +946,7 @@ cifs_demultiplex_thread(void *p)
} else {
mids[0] = server->ops->find_mid(server, buf);
bufs[0] = buf;
if (mids[0])
num_mids = 1;
num_mids = 1;
if (!mids[0] || !mids[0]->receive)
length = standard_receive3(server, mids[0]);

2
fs/cifs/smb2ops.c
View File

@ -1477,7 +1477,7 @@ smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
}
srch_inf->entries_in_buffer = 0;
srch_inf->index_of_last_entry = 0;
srch_inf->index_of_last_entry = 2;
rc = SMB2_query_directory(xid, tcon, fid->persistent_fid,
fid->volatile_fid, 0, srch_inf);

21
fs/cifs/transport.c
View File

@ -142,7 +142,8 @@ void
cifs_delete_mid(struct mid_q_entry *mid)
{
spin_lock(&GlobalMid_Lock);
list_del(&mid->qhead);
list_del_init(&mid->qhead);
mid->mid_flags |= MID_DELETED;
spin_unlock(&GlobalMid_Lock);
DeleteMidQEntry(mid);
@ -772,6 +773,11 @@ cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst)
return mid;
}
static void
cifs_noop_callback(struct mid_q_entry *mid)
{
}
int
compound_send_recv(const unsigned int xid, struct cifs_ses *ses,
const int flags, const int num_rqst, struct smb_rqst *rqst,
@ -826,8 +832,13 @@ compound_send_recv(const unsigned int xid, struct cifs_ses *ses,
}
midQ[i]->mid_state = MID_REQUEST_SUBMITTED;
/*
* We don't invoke the callback compounds unless it is the last
* request.
*/
if (i < num_rqst - 1)
midQ[i]->callback = cifs_noop_callback;
}
cifs_in_send_inc(ses->server);
rc = smb_send_rqst(ses->server, num_rqst, rqst, flags);
cifs_in_send_dec(ses->server);
@ -908,6 +919,12 @@ compound_send_recv(const unsigned int xid, struct cifs_ses *ses,
midQ[i]->resp_buf = NULL;
}
out:
/*
* This will dequeue all mids. After this it is important that the
* demultiplex_thread will not process any of these mids any futher.
* This is prevented above by using a noop callback that will not
* wake this thread except for the very last PDU.
*/
for (i = 0; i < num_rqst; i++)
cifs_delete_mid(midQ[i]);
add_credits(ses->server, credits, optype);