From: Ma Ke Date: Tue, 12 Aug 2025 07:25:09 +0000 (+0800) Subject: pcmcia: Fix a NULL pointer dereference in __iodyn_find_io_region() X-Git-Tag: v6.17-rc5~20^2~6 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=44822df89e8f3386871d9cad563ece8e2fd8f0e7;p=thirdparty%2Fkernel%2Fstable.git pcmcia: Fix a NULL pointer dereference in __iodyn_find_io_region() 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. Cc: stable@vger.kernel.org Fixes: 49b1153adfe1 ("pcmcia: move all pcmcia_resource_ops providers into one module") Signed-off-by: Ma Ke Signed-off-by: Dominik Brodowski --- diff --git a/drivers/pcmcia/rsrc_iodyn.c b/drivers/pcmcia/rsrc_iodyn.c index b04b16496b0c4..2677b577c1f85 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;