Add check for the return value of pcmcia_make_resource()
to prevent null pointer dereference.

Fixes: 49b1153adfe1 ("pcmcia: move all pcmcia_resource_ops providers into one module")
Cc: stable@vger.kernel.org
Signed-off-by: Haoxiang Li <haoxiang_li2024@163.com>
---
 drivers/pcmcia/rsrc_iodyn.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pcmcia/rsrc_iodyn.c b/drivers/pcmcia/rsrc_iodyn.c
index b04b16496b0c..2677b577c1f8 100644
--- a/drivers/pcmcia/rsrc_iodyn.c
+++ b/drivers/pcmcia/rsrc_iodyn.c
@@ -62,6 +62,9 @@ static struct resource *__iodyn_find_io_region(struct pcmcia_socket *s,
 	unsigned long min = base;
 	int ret;
 
+	if (!res)
+		return NULL;
+
 	data.mask = align - 1;
 	data.offset = base & data.mask;
 
-- 
2.25.1