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cifs: refcount only the selected iface during interface update

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commit 7246210ecd upstream.

When the server interface for a channel is not active anymore,
we have the logic to select an alternative interface. However
this was not breaking out of the loop as soon as a new alternative
was found. As a result, some interfaces may get refcounted unintentionally.

There was also a bug in checking if we found an alternate iface.
Fixed that too.

Fixes: b54034a73b ("cifs: during reconnect, update interface if necessary")
Cc: stable@vger.kernel.org # 5.19+
Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shyam Prasad N 2022-12-27 11:29:28 +00:00 committed by Greg Kroah-Hartman
parent 76f1ff02e2
commit 94d0e33c5f
1 changed files with 2 additions and 1 deletions
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3
fs/cifs/sess.c
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@ -292,9 +292,10 @@ cifs_chan_update_iface(struct cifs_ses *ses, struct TCP_Server_Info *server)
continue;
}
kref_get(&iface->refcount);
break;
}
if (!list_entry_is_head(iface, &ses->iface_list, iface_head)) {
if (list_entry_is_head(iface, &ses->iface_list, iface_head)) {
rc = 1;
iface = NULL;
cifs_dbg(FYI, "unable to find a suitable iface\n");