This is a note to let you know that I've just added the patch titled
cifs: do not let cifs_chan_update_iface deallocate channels
to the 6.6-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-do-not-let-cifs_chan_update_iface-deallocate-ch.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d7cdeb65f0d231f916e573d85ece1dca4633d7e7
Author: Shyam Prasad N <sprasad@xxxxxxxxxxxxx>
Date: Fri Dec 15 17:16:56 2023 +0000
cifs: do not let cifs_chan_update_iface deallocate channels
[ Upstream commit 12d1e301bdfd1f2e2f371432dedef7cce8f01c4a ]
cifs_chan_update_iface is meant to check and update the server
interface used for a channel when the existing server interface
is no longer available.
So far, this handler had the code to remove an interface entry
even if a new candidate interface is not available. Allowing
this leads to several corner cases to handle.
This change makes the logic much simpler by not deallocating
the current channel interface entry if a new interface is not
found to replace it with.
Signed-off-by: Shyam Prasad N <sprasad@xxxxxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Stable-dep-of: 16a57d768111 ("cifs: reduce warning log level for server not advertising interfaces")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/smb/client/sess.c b/fs/smb/client/sess.c
index 2fc2fbb260bf0..0d76757528e49 100644
--- a/fs/smb/client/sess.c
+++ b/fs/smb/client/sess.c
@@ -438,7 +438,7 @@ cifs_chan_update_iface(struct cifs_ses *ses, struct TCP_Server_Info *server)
cifs_dbg(FYI, "unable to find a suitable iface\n");
}
- if (!chan_index && !iface) {
+ if (!iface) {
cifs_dbg(FYI, "unable to get the interface matching: %pIS\n",
&ss);
spin_unlock(&ses->iface_lock);
@@ -446,7 +446,7 @@ cifs_chan_update_iface(struct cifs_ses *ses, struct TCP_Server_Info *server)
}
/* now drop the ref to the current iface */
- if (old_iface && iface) {
+ if (old_iface) {
cifs_dbg(FYI, "replacing iface: %pIS with %pIS\n",
&old_iface->sockaddr,
&iface->sockaddr);
@@ -459,44 +459,32 @@ cifs_chan_update_iface(struct cifs_ses *ses, struct TCP_Server_Info *server)
kref_put(&old_iface->refcount, release_iface);
} else if (old_iface) {
- cifs_dbg(FYI, "releasing ref to iface: %pIS\n",
+ /* if a new candidate is not found, keep things as is */
+ cifs_dbg(FYI, "could not replace iface: %pIS\n",
&old_iface->sockaddr);
-
- old_iface->num_channels--;
- if (old_iface->weight_fulfilled)
- old_iface->weight_fulfilled--;
-
- kref_put(&old_iface->refcount, release_iface);
} else if (!chan_index) {
/* special case: update interface for primary channel */
- cifs_dbg(FYI, "referencing primary channel iface: %pIS\n",
- &iface->sockaddr);
- iface->num_channels++;
- iface->weight_fulfilled++;
- } else {
- WARN_ON(!iface);
- cifs_dbg(FYI, "adding new iface: %pIS\n", &iface->sockaddr);
+ if (iface) {
+ cifs_dbg(FYI, "referencing primary channel iface: %pIS\n",
+ &iface->sockaddr);
+ iface->num_channels++;
+ iface->weight_fulfilled++;
+ }
}
spin_unlock(&ses->iface_lock);
- spin_lock(&ses->chan_lock);
- chan_index = cifs_ses_get_chan_index(ses, server);
- if (chan_index == CIFS_INVAL_CHAN_INDEX) {
+ if (iface) {
+ spin_lock(&ses->chan_lock);
+ chan_index = cifs_ses_get_chan_index(ses, server);
+ if (chan_index == CIFS_INVAL_CHAN_INDEX) {
+ spin_unlock(&ses->chan_lock);
+ return 0;
+ }
+
+ ses->chans[chan_index].iface = iface;
spin_unlock(&ses->chan_lock);
- return 0;
}
- ses->chans[chan_index].iface = iface;
-
- /* No iface is found. if secondary chan, drop connection */
- if (!iface && SERVER_IS_CHAN(server))
- ses->chans[chan_index].server = NULL;
-
- spin_unlock(&ses->chan_lock);
-
- if (!iface && SERVER_IS_CHAN(server))
- cifs_put_tcp_session(server, false);
-
return rc;
}
