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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>
This commit is contained in:
Srinivas Pandruvada 2023-06-22 12:57:17 -07:00 committed by Hans de Goede
parent 6bf06f14bf
commit 5b2a4a4394
1 changed files with 1 additions and 3 deletions
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4
drivers/platform/x86/intel/tpmi.c
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@ -356,9 +356,7 @@ static int intel_vsec_tpmi_init(struct auxiliary_device *auxdev)
if (!pfs_start)
pfs_start = res_start;
pfs->pfs_header.cap_offset *= TPMI_CAP_OFFSET_UNIT;
pfs->vsec_offset = pfs_start + pfs->pfs_header.cap_offset;
pfs->vsec_offset = pfs_start + pfs->pfs_header.cap_offset * TPMI_CAP_OFFSET_UNIT;
/*
* Process TPMI_INFO to get PCI device to CPU package ID.