platform/x86/intel/tpmi: Prevent overflow for cap_offset
authorSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Thu, 22 Jun 2023 19:57:17 +0000 (12:57 -0700)
committerHans de Goede <hdegoede@redhat.com>
Mon, 10 Jul 2023 13:13:49 +0000 (15:13 +0200)
commit5b2a4a4394ce96fb01a282dd58e263d02218db03
treed185bac166dc87653edd25409188a6b8f63ec91b
parent6bf06f14bf33d668ee0eb85b6c414d85a0f8e1a5
platform/x86/intel/tpmi: Prevent overflow for cap_offset

cap_offset is a u16 field, so multiplying with TPMI_CAP_OFFSET_UNIT
(which is equal to 1024) to covert to bytes will cause overflow. This
will be a problem once more TPMI features are added.

This field is not used except for calculating pfs->vsec_offset. So, leave
cap_offset field unchanged and multiply with TPMI_CAP_OFFSET_UNIT while
calculating pfs->vsec_offset.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://lore.kernel.org/r/20230622195717.3125088-1-srinivas.pandruvada@linux.intel.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
drivers/platform/x86/intel/tpmi.c