[for-6.11 PATCH 04/29] sunrpc: handle NULL req->defer in cache_defer_req

[Mike Snitzer <snitzer@kernel.org>]

From: Weston Andros Adamson <dros@primarydata.com>

Dont crash with a NULL pointer dereference when req->defer isn't
set. This is needed for the localio path.

Signed-off-by: Weston Andros Adamson <dros@primarydata.com>
Signed-off-by: Lance Shelton <lance.shelton@hammerspace.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
---
 net/sunrpc/cache.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index 95ff74706104..b757b891382c 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -714,6 +714,8 @@ static bool cache_defer_req(struct cache_req *req, struct cache_head *item)
 			return false;
 	}
 
+	if (!req->defer)
+		return false;
 	dreq = req->defer(req);
 	if (dreq == NULL)
 		return false;
-- 
2.44.0