This is a note to let you know that I've just added the patch titled
cifs: prevent infinite recursion in CIFSGetDFSRefer()
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
cifs-prevent-infinite-recursion-in-cifsgetdfsrefer.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 09ba47b44d26b475bbdf9c80db9e0193d2b58956 Mon Sep 17 00:00:00 2001
From: Paulo Alcantara <pc@xxxxxxxxxxxxx>
Date: Wed, 29 Mar 2023 17:14:22 -0300
Subject: cifs: prevent infinite recursion in CIFSGetDFSRefer()
From: Paulo Alcantara <pc@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
Reviewed-by: Ronnie Sahlberg <lsahlber@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 6.2
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/cifs/cifssmb.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -4895,8 +4895,13 @@ CIFSGetDFSRefer(const unsigned int xid,
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;
Patches currently in stable-queue which might be from pc@xxxxxxxxxxxxx are
queue-4.19/cifs-prevent-infinite-recursion-in-cifsgetdfsrefer.patch
queue-4.19/cifs-empty-interface-list-when-server-doesn-t-support-query-interfaces.patch
queue-4.19/cifs-fix-dfs-traversal-oops-without-config_cifs_dfs_upcall.patch
