diff options
| author | Frans Klaver <fransklaver@gmail.com> | 2014-09-17 23:47:26 +0200 |
|---|---|---|
| committer | Darren Hart <dvhart@linux.intel.com> | 2014-09-19 09:42:11 -0700 |
| commit | a5c155b16f4c170d96d41fc6066f245f2d53604d (patch) | |
| tree | 9dee97f27ca749bb850a8766a85e577df22655c0 /drivers/platform | |
| parent | 48d4a5b29c8d0cf544ffe96f5855452446b6f20d (diff) | |
| download | linux-a5c155b16f4c170d96d41fc6066f245f2d53604d.tar.bz2 | |
eeepc-laptop: check proper return values in get_cpufv
In get_cpufv the return value of get_acpi is stored in the cpufv struct.
Right before this value is checked for errors, it is and'ed with 0xff.
This means c->cur can never be less than zero. Besides that, the actual
error value is ignored.
c->num is also and'ed with 0xff, which means we can ignore values below
zero.
Check the result of get_acpi() right away. While at it, propagate the
error if we got one.
Signed-off-by: Frans Klaver <fransklaver@gmail.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
Diffstat (limited to 'drivers/platform')
| -rw-r--r-- | drivers/platform/x86/eeepc-laptop.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/platform/x86/eeepc-laptop.c b/drivers/platform/x86/eeepc-laptop.c index e93a54edb17a..875a43fcaa86 100644 --- a/drivers/platform/x86/eeepc-laptop.c +++ b/drivers/platform/x86/eeepc-laptop.c @@ -332,9 +332,12 @@ struct eeepc_cpufv { static int get_cpufv(struct eeepc_laptop *eeepc, struct eeepc_cpufv *c) { c->cur = get_acpi(eeepc, CM_ASL_CPUFV); + if (c->cur < 0) + return -ENODEV; + c->num = (c->cur >> 8) & 0xff; c->cur &= 0xff; - if (c->cur < 0 || c->num <= 0 || c->num > 12) + if (c->num == 0 || c->num > 12) return -ENODEV; return 0; } |