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 989e275..6dcda86 100644
--- a/drivers/ssb/pci.c
+++ b/drivers/ssb/pci.c
@@ -625,9 +625,12 @@
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)
