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Add a workaround for buggy bootloader's out-of-range access

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This commit is contained in:
longpanda
2021-03-24 10:07:07 +08:00
parent 33cc1e271a
commit 64748308a3
4 changed files with 41 additions and 1 deletions
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18
EDK2/edk2_mod/edk2-edk2-stable201911/MdeModulePkg/Application/Ventoy/VentoyProtocol.c
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@@ -438,6 +438,8 @@ EFI_STATUS EFIAPI ventoy_block_io_read
UINT32 j = 0;
UINT32 lbacount = 0;
UINT32 secNum = 0;
UINT32 TmpNum = 0;
UINT64 VirtSec = 0;
UINT64 offset = 0;
EFI_LBA curlba = 0;
EFI_LBA lastlba = 0;
@@ -461,6 +463,22 @@ EFI_STATUS EFIAPI ventoy_block_io_read
{
return ventoy_read_iso_sector(Lba, secNum, Buffer);
}
else if (offset < g_chain->real_img_size_in_bytes)
{
TmpNum = (g_chain->real_img_size_in_bytes - offset) / 2048;
ventoy_read_iso_sector(Lba, TmpNum, Buffer);
Lba += TmpNum;
secNum -= TmpNum;
Buffer = (UINT8 *)Buffer + (g_chain->real_img_size_in_bytes - offset);
offset = Lba * 2048;
}
VirtSec = g_chain->virt_img_size_in_bytes / 2048;
if (Lba + secNum > VirtSec)
{
secNum = VirtSec - Lba;
}
if (secNum > g_sector_flag_num)
{