38 lines
1.4 KiB
Diff
38 lines
1.4 KiB
Diff
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From 1fb473e41bcbfbe21c02bcb30983b87aa94a6cb8 Mon Sep 17 00:00:00 2001
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From: Al Stone <ahs3@ahs3.net>
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Date: Tue, 13 Aug 2024 09:50:37 -0600
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Subject: [PATCH] PHAT FW health table can be zero-length
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When calculating the VendorLength of the PHAT FW health data subtable,
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the result becomes a negative integer. However, since UINT32 is being
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used, it looks like a huge positive integer instead. Conditionalize
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the length calculation to handle this case properly.
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This was discovered by using the command: iasl -T phat
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Signed-off-by: Al Stone <ahs3@ahs3.net>
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---
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source/common/dmtbdump2.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/source/common/dmtbdump2.c b/source/common/dmtbdump2.c
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index 32b76b382..dd4d4878e 100644
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--- a/source/common/dmtbdump2.c
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+++ b/source/common/dmtbdump2.c
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@@ -2432,8 +2432,10 @@ AcpiDmDumpPhat (
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/* Get Device-Specific Data - length of which is the remaining subtable length. */
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- VendorLength =
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- Subtable->Length - sizeof (ACPI_PHAT_HEALTH_DATA) - PathLength;
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+ VendorLength = 0;
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+ if (Subtable->Length > sizeof (ACPI_PHAT_HEALTH_DATA) + PathLength)
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+ VendorLength =
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+ Subtable->Length - sizeof (ACPI_PHAT_HEALTH_DATA) - PathLength;
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DbgPrint (ASL_DEBUG_OUTPUT, "%u, Subtable->Length %X, VendorLength %X, Offset %X PathLength: %X\n",
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__LINE__, Subtable->Length, VendorLength, Offset, PathLength);
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--
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2.45.2
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