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eeepc-laptop: check proper return values in get_cpufv

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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>
This commit is contained in:
Frans Klaver 2014-09-17 23:47:26 +02:00 committed by Darren Hart
parent 48d4a5b29c
commit a5c155b16f
1 changed files with 4 additions and 1 deletions
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5
drivers/platform/x86/eeepc-laptop.c
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@ -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;
}