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four cifs/smb3 client fixes, including two for stable

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Merge tag '6.3-rc4-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull cifs client fixes from Steve French:
 "Four cifs/smb3 client (reconnect and DFS related) fixes, including two
  for stable:

   - DFS oops fix

   - DFS reconnect recursion fix

   - An SMB1 parallel reconnect fix

   - Trivial dead code removal in smb2_reconnect"

* tag '6.3-rc4-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: get rid of dead check in smb2_reconnect()
  cifs: prevent infinite recursion in CIFSGetDFSRefer()
  cifs: avoid races in parallel reconnects in smb1
  cifs: fix DFS traversal oops without CONFIG_CIFS_DFS_UPCALL
This commit is contained in:
Linus Torvalds 2023-04-01 14:50:22 -07:00
commit f7772da662
3 changed files with 26 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
fs/cifs/cifsfs.h
View File

@ -124,7 +124,10 @@ extern const struct dentry_operations cifs_ci_dentry_ops;
#ifdef CONFIG_CIFS_DFS_UPCALL
extern struct vfsmount *cifs_dfs_d_automount(struct path *path);
#else
#define cifs_dfs_d_automount NULL
static inline struct vfsmount *cifs_dfs_d_automount(struct path *path)
{
return ERR_PTR(-EREMOTE);
}
#endif
/* Functions related to symlinks */

30
fs/cifs/cifssmb.c
View File

@ -71,7 +71,7 @@ cifs_reconnect_tcon(struct cifs_tcon *tcon, int smb_command)
int rc;
struct cifs_ses *ses;
struct TCP_Server_Info *server;
struct nls_table *nls_codepage;
struct nls_table *nls_codepage = NULL;
/*
* SMBs NegProt, SessSetup, uLogoff do not have tcon yet so check for
@ -99,6 +99,7 @@ cifs_reconnect_tcon(struct cifs_tcon *tcon, int smb_command)
}
spin_unlock(&tcon->tc_lock);
again:
rc = cifs_wait_for_server_reconnect(server, tcon->retry);
if (rc)
return rc;
@ -110,8 +111,7 @@ cifs_reconnect_tcon(struct cifs_tcon *tcon, int smb_command)
}
spin_unlock(&ses->chan_lock);
nls_codepage = load_nls_default();
mutex_lock(&ses->session_mutex);
/*
* Recheck after acquire mutex. If another thread is negotiating
* and the server never sends an answer the socket will be closed
@ -120,29 +120,38 @@ cifs_reconnect_tcon(struct cifs_tcon *tcon, int smb_command)
spin_lock(&server->srv_lock);
if (server->tcpStatus == CifsNeedReconnect) {
spin_unlock(&server->srv_lock);
mutex_lock(&ses->session_mutex);
if (tcon->retry)
goto again;
rc = -EHOSTDOWN;
goto out;
}
spin_unlock(&server->srv_lock);
nls_codepage = load_nls_default();
/*
* need to prevent multiple threads trying to simultaneously
* reconnect the same SMB session
*/
spin_lock(&ses->ses_lock);
spin_lock(&ses->chan_lock);
if (!cifs_chan_needs_reconnect(ses, server)) {
if (!cifs_chan_needs_reconnect(ses, server) &&
ses->ses_status == SES_GOOD) {
spin_unlock(&ses->chan_lock);
spin_unlock(&ses->ses_lock);
/* this means that we only need to tree connect */
if (tcon->need_reconnect)
goto skip_sess_setup;
rc = -EHOSTDOWN;
mutex_unlock(&ses->session_mutex);
goto out;
}
spin_unlock(&ses->chan_lock);
spin_unlock(&ses->ses_lock);
mutex_lock(&ses->session_mutex);
rc = cifs_negotiate_protocol(0, ses, server);
if (!rc)
rc = cifs_setup_session(0, ses, server, nls_codepage);
@ -4373,8 +4382,13 @@ CIFSGetDFSRefer(const unsigned int xid, struct cifs_ses *ses,
return -ENODEV;
getDFSRetry:
rc = smb_init(SMB_COM_TRANSACTION2, 15, ses->tcon_ipc, (void **) &pSMB,
(void **) &pSMBr);
/*
* Use smb_init_no_reconnect() instead of smb_init() as
* CIFSGetDFSRefer() may be called from cifs_reconnect_tcon() and thus
* causing an infinite recursion.
*/
rc = smb_init_no_reconnect(SMB_COM_TRANSACTION2, 15, ses->tcon_ipc,
(void **)&pSMB, (void **)&pSMBr);
if (rc)
return rc;

1
fs/cifs/smb2pdu.c
View File

@ -310,7 +310,6 @@ out:
case SMB2_READ:
case SMB2_WRITE:
case SMB2_LOCK:
case SMB2_IOCTL:
case SMB2_QUERY_DIRECTORY:
case SMB2_CHANGE_NOTIFY:
case SMB2_QUERY_INFO: