[PATCH] pcmcia/pcmcia_resource.c: fix crash when using Cardbus cards

Using the old ioctl interface together with cardbus card gives a NULL
pointer dereference since cardbus devices don't have a struct pcmcia_device.
also s->io[0].res can be NULL as well.

Fix is to move the pcmcia code after the cardbus code and to check for a null
pointer.

Signed-off-by: Daniel Ritz <daniel.ritz@gmx.ch>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

1 files changed, 11 insertions, 4 deletions

diff --git a/drivers/pcmcia/pcmcia_resource.c b/drivers/pcmcia/pcmcia_resource.c
index cc3402c9b2c3..3131bb0a0095 100644
--- a/drivers/pcmcia/pcmcia_resource.c
+++ b/drivers/pcmcia/pcmcia_resource.c
@@ -208,7 +208,6 @@ int pccard_get_configuration_info(struct pcmcia_socket *s,
         if (!(s->state & SOCKET_PRESENT))
                 return CS_NO_CARD;
 
-        config->Function = p_dev->func;
 
 #ifdef CONFIG_CARDBUS
         if (s->state & SOCKET_CARDBUS) {
@@ -222,14 +221,22 @@ int pccard_get_configuration_info(struct pcmcia_socket *s,
                         config->AssignedIRQ = s->irq.AssignedIRQ;
                         if (config->AssignedIRQ)
                                 config->Attributes |= CONF_ENABLE_IRQ;
-                        config->BasePort1 = s->io[0].res->start;
-                        config->NumPorts1 = s->io[0].res->end - config->BasePort1 + 1;
+                        if (s->io[0].res) {
+                                config->BasePort1 = s->io[0].res->start;
+                                config->NumPorts1 = s->io[0].res->end - config->BasePort1 + 1;
+                        }
                 }
                 return CS_SUCCESS;
         }
 #endif
 
-        c = (p_dev) ? p_dev->function_config : NULL;
+        if (p_dev) {
+                c = p_dev->function_config;
+                config->Function = p_dev->func;
+        } else {
+                c = NULL;
+                config->Function = 0;
+        }
 
         if ((c == NULL) || !(c->state & CONFIG_LOCKED)) {
                 config->Attributes = 0;