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[drivers][block][efi] Fix GPT partition entry underflow vulnerability #11275

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[drivers][block][efi] Fix GPT partition entry underflow vulnerability #11275

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Copilot Mar 19, 2026
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[drivers][block][efi] Fix GPT partition entry underflow vulnerability
Copilot Mar 19, 2026
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8 changes: 6 additions & 2 deletions components/drivers/block/partitions/efi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -454,9 +454,13 @@ static rt_bool_t is_gpt_valid(struct rt_blk_disk *disk,
*/
rt_inline rt_bool_t is_pte_valid(const gpt_entry *pte, const rt_size_t lastlba)
{
rt_uint64_t start = rt_le64_to_cpu(pte->starting_lba);
rt_uint64_t end = rt_le64_to_cpu(pte->ending_lba);

if ((!efi_guidcmp(pte->partition_type_guid, NULL_GUID)) ||
rt_le64_to_cpu(pte->starting_lba) > lastlba ||
rt_le64_to_cpu(pte->ending_lba) > lastlba)
start > lastlba ||
end > lastlba ||
end < start)
{
return RT_FALSE;
}
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