Shyam Prasad N <nspmangalore@xxxxxxxxx> wrote: > From 604ab4c350c2552daa8e77f861a54032b49bc706 Mon Sep 17 00:00:00 2001 > From: Shyam Prasad N <sprasad@xxxxxxxxxxxxx> > Date: Sat, 18 Dec 2021 17:28:10 +0000 > Subject: [PATCH] cifs: invalidate dns resolver keys after use > > We rely on dns resolver module to upcall to userspace > using request_key and get us the DNS mapping. > However, the invalidate arg for dns_query was set > to false, which meant that the key created during the > first call for a hostname would continue to be cached > till it expires. This expiration period depends on > how the dns_resolver is configured. > > Fixing this by setting invalidate=true during dns_query. > This means that the key will be cleaned up by dns_resolver > soon after it returns the data. This also means that > the dns_resolver subsystem will not cache the key for > an interval indicated by the DNS records TTL. But this is > okay since we use the TTL value returned to schedule the > next lookup. > > Signed-off-by: Shyam Prasad N <sprasad@xxxxxxxxxxxxx> Acked-by: David Howells <dhowells@xxxxxxxxxx>
