Many thanks, applied to pcmcia-next. This allocation is practically no-fail owing to GFP_KERNEL and the small allocation size, and rsrc_iodyn.c is on its way out, but it's better safe than to be sorry.

Best, Dominik

Am Tue, Aug 12, 2025 at 03:25:09PM +0800 schrieb Ma Ke:

In __iodyn_find_io_region(), pcmcia_make_resource() is assigned to res and used in pci_bus_alloc_resource(). There is a dereference of res in pci_bus_alloc_resource(), which could lead to a NULL pointer dereference on failure of pcmcia_make_resource().

Fix this bug by adding a check of res.

Found by code review, complie tested only.

Cc: stable@vger.kernel.org Fixes: 49b1153adfe1 ("pcmcia: move all pcmcia_resource_ops providers into one module") Signed-off-by: Ma Ke make24@iscas.ac.cn

---

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