Messages in this thread Patch in this message | | | Date | Fri, 06 Aug 2010 12:20:16 -0700 | From | Greg KH <> | Subject | [35/36] ssb: fix NULL ptr deref when pcihost_wrapper is used |
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2.6.34-stable review patch. If anyone has any objections, please let us know.
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From: Christoph Fritz <chf.fritz@googlemail.com>
commit da1fdb02d9200ff28b6f3a380d21930335fe5429 upstream.
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> Cc: Larry Finger <Larry.Finger@lwfinger.net> Cc: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- drivers/ssb/pci.c | 9 ++++++--- drivers/ssb/sprom.c | 1 + 2 files changed, 7 insertions(+), 3 deletions(-)
--- a/drivers/ssb/pci.c +++ b/drivers/ssb/pci.c @@ -625,9 +625,12 @@ static int ssb_pci_sprom_get(struct ssb_ 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) --- a/drivers/ssb/sprom.c +++ b/drivers/ssb/sprom.c @@ -185,6 +185,7 @@ bool ssb_is_sprom_available(struct ssb_b /* 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;
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