Commit 10e4ac57 authored by Jesper Juhl's avatar Jesper Juhl Committed by Jiri Kosina

viacam: Don't explode if pci_find_bus() returns NULL

In the unlikely case that pci_find_bus() should return NULL
viacam_serial_is_enabled() is going to dereference a NULL pointer and
blow up. Better safe than sorry, so be defensive and check the
pointer.
Signed-off-by: default avatarJesper Juhl <jj@chaosbits.net>
Acked-by: default avatarJonathan Corbet <corbet@lwn.net>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 12922084
......@@ -1332,6 +1332,8 @@ static __devinit bool viacam_serial_is_enabled(void)
struct pci_bus *pbus = pci_find_bus(0, 0);
u8 cbyte;
if (!pbus)
return false;
pci_bus_read_config_byte(pbus, VIACAM_SERIAL_DEVFN,
VIACAM_SERIAL_CREG, &cbyte);
if ((cbyte & VIACAM_SERIAL_BIT) == 0)
......
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