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cifs: prevent infinite recursion in CIFSGetDFSRefer()

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commit 09ba47b44d26b475bbdf9c80db9e0193d2b58956 upstream.

We can't call smb_init() in CIFSGetDFSRefer() as cifs_reconnect_tcon()
may end up calling CIFSGetDFSRefer() again to get new DFS referrals
and thus causing an infinite recursion.

Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Cc: stable@vger.kernel.org # 6.2
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paulo Alcantara 2023-03-29 17:14:22 -03:00 committed by Greg Kroah-Hartman
parent 51d6573711
commit 03af69bd67
1 changed files with 7 additions and 2 deletions
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9
fs/cifs/cifssmb.c
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@ -4933,8 +4933,13 @@ 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;