ssb: fix NULL ptr deref when pcihost_wrapper is used

Ethernet driver b44 does register ssb by it's pcihost_wrapper
and doesn't set ssb_chipcommon. A check on this value
introduced with commit d53cdbb94a52a920d5420ed64d986c3523a56743
and ea2db495f92ad2cf3301623e60cb95b4062bc484 triggers:

BUG: unable to handle kernel NULL pointer dereference at 00000010
IP: [<c1266c36>] ssb_is_sprom_available+0x16/0x30

Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/ssb/pci.c b/drivers/ssb/pci.c
index 989e2752cc36d8abb9613b6c77b50936be85184c..6dcda86be6ebdb83d579d27907ee1f153889000a 100644 (file)
--- a/drivers/ssb/pci.c
+++ b/drivers/ssb/pci.c
@@ -625,9 +625,12 @@ static int ssb_pci_sprom_get(struct ssb_bus *bus,
                ssb_printk(KERN_ERR PFX "No SPROM available!\n");
                return -ENODEV;
        }
-
-       bus->sprom_offset = (bus->chipco.dev->id.revision < 31) ?
-               SSB_SPROM_BASE1 : SSB_SPROM_BASE31;
+       if (bus->chipco.dev) {  /* can be unavailible! */
+               bus->sprom_offset = (bus->chipco.dev->id.revision < 31) ?
+                       SSB_SPROM_BASE1 : SSB_SPROM_BASE31;
+       } else {
+               bus->sprom_offset = SSB_SPROM_BASE1;
+       }
 
        buf = kcalloc(SSB_SPROMSIZE_WORDS_R123, sizeof(u16), GFP_KERNEL);
        if (!buf)

diff --git a/drivers/ssb/sprom.c b/drivers/ssb/sprom.c
index 007bc3a03486b621034134f33a1c3029cb8e0b29..4f7cc8d13277ddb84126430923202f9fa7938ac7 100644 (file)
--- a/drivers/ssb/sprom.c
+++ b/drivers/ssb/sprom.c
@@ -185,6 +185,7 @@ bool ssb_is_sprom_available(struct ssb_bus *bus)
        /* this routine differs from specs as we do not access SPROM directly
           on PCMCIA */
        if (bus->bustype == SSB_BUSTYPE_PCI &&
+           bus->chipco.dev &&  /* can be unavailible! */
            bus->chipco.dev->id.revision >= 31)
                return bus->chipco.capabilities & SSB_CHIPCO_CAP_SPROM;