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From e44306f00bd12f4dca2db20eaba103ff2f260d87 Mon Sep 17 00:00:00 2001
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From: Rod Smith <rodsmith@rodsbooks.com>
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Date: Mon, 14 Sep 2020 10:08:18 -0400
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Subject: [PATCH 1/2] Fix segfault on some weird data structures
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---
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gpt.cc | 13 ++++++++++++-
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1 file changed, 12 insertions(+), 1 deletion(-)
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diff --git a/gpt.cc b/gpt.cc
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index 03a2156..d0242d3 100644
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--- a/gpt.cc
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+++ b/gpt.cc
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@@ -983,6 +983,14 @@ int GPTData::LoadHeader(struct GPTHeader *header, DiskIO & disk, uint64_t sector
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} // if
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*crcOk = CheckHeaderCRC(&tempHeader);
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+ if (tempHeader.sizeOfPartitionEntries != sizeof(GPTPart)) {
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+ cerr << "Warning: Partition table header claims that the size of partition table\n";
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+ cerr << "entries is " << tempHeader.sizeOfPartitionEntries << " bytes, but this program ";
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+ cerr << " supports only " << sizeof(GPTPart) << "-byte entries.\n";
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+ cerr << "Adjusting accordingly, but partition table may be garbage.\n";
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+ tempHeader.sizeOfPartitionEntries = sizeof(GPTPart);
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+ }
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+
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if (allOK && (numParts != tempHeader.numParts) && *crcOk) {
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allOK = SetGPTSize(tempHeader.numParts, 0);
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}
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@@ -1000,7 +1008,10 @@ int GPTData::LoadPartitionTable(const struct GPTHeader & header, DiskIO & disk,
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uint32_t sizeOfParts, newCRC;
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int retval;
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- if (disk.OpenForRead()) {
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+ if (header.sizeOfPartitionEntries != sizeof(GPTPart)) {
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+ cerr << "Error! GPT header contains invalid partition entry size!\n";
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+ retval = 0;
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+ } else if (disk.OpenForRead()) {
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if (sector == 0) {
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retval = disk.Seek(header.partitionEntriesLBA);
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} else {
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--
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2.35.1
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