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three smb3 client fixes: 2 related to multichannel, one for working around a negotiate protocol bug in some Samba servers

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Merge tag '5.19-rc6-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull cifs fixes from Steve French:
 "Three smb3 client fixes:

   - two multichannel fixes: fix a potential deadlock freeing a channel,
     and fix a race condition on failed creation of a new channel

   - mount failure fix: work around a server bug in some common older
     Samba servers by avoiding padding at the end of the negotiate
     protocol request"

* tag '5.19-rc6-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  smb3: workaround negprot bug in some Samba servers
  cifs: remove unnecessary locking of chan_lock while freeing session
  cifs: fix race condition with delayed threads
This commit is contained in:
Linus Torvalds 2022-07-14 12:35:15 -07:00
commit f41d5df5f1
3 changed files with 16 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
fs/cifs/connect.c
View file

@ -1918,7 +1918,6 @@ void cifs_put_smb_ses(struct cifs_ses *ses)
list_del_init(&ses->smb_ses_list);
spin_unlock(&cifs_tcp_ses_lock);
spin_lock(&ses->chan_lock);
chan_count = ses->chan_count;
/* close any extra channels */
@ -1934,7 +1933,6 @@ void cifs_put_smb_ses(struct cifs_ses *ses)
ses->chans[i].server = NULL;
}
}
spin_unlock(&ses->chan_lock);
sesInfoFree(ses);
cifs_put_tcp_session(server, 0);

11
fs/cifs/sess.c
View file

@ -474,6 +474,14 @@ cifs_ses_add_channel(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
out:
if (rc && chan->server) {
/*
* we should avoid race with these delayed works before we
* remove this channel
*/
cancel_delayed_work_sync(&chan->server->echo);
cancel_delayed_work_sync(&chan->server->resolve);
cancel_delayed_work_sync(&chan->server->reconnect);
spin_lock(&ses->chan_lock);
/* we rely on all bits beyond chan_count to be clear */
cifs_chan_clear_need_reconnect(ses, chan->server);
@ -484,10 +492,9 @@ cifs_ses_add_channel(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
*/
WARN_ON(ses->chan_count < 1);
spin_unlock(&ses->chan_lock);
}
if (rc && chan->server)
cifs_put_tcp_session(chan->server, 0);
}
return rc;
}

13
fs/cifs/smb2pdu.c
View file

@ -571,10 +571,6 @@ assemble_neg_contexts(struct smb2_negotiate_req *req,
*total_len += ctxt_len;
pneg_ctxt += ctxt_len;
build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
*total_len += sizeof(struct smb2_posix_neg_context);
pneg_ctxt += sizeof(struct smb2_posix_neg_context);
/*
* secondary channels don't have the hostname field populated
* use the hostname field in the primary channel instead
@ -586,9 +582,14 @@ assemble_neg_contexts(struct smb2_negotiate_req *req,
hostname);
*total_len += ctxt_len;
pneg_ctxt += ctxt_len;
neg_context_count = 4;
} else /* second channels do not have a hostname */
neg_context_count = 3;
} else
neg_context_count = 2;
build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
*total_len += sizeof(struct smb2_posix_neg_context);
pneg_ctxt += sizeof(struct smb2_posix_neg_context);
neg_context_count++;
if (server->compress_algorithm) {
build_compression_ctxt((struct smb2_compression_capabilities_context *)