From: Erich McMillan <emcmillan@microsoft.com>
Details for these CodeQL alerts can be found here:
- Pointer overflow check (cpp/pointer-overflow-check):
- https://cwe.mitre.org/data/definitions/758.html
- Potential buffer overflow check (cpp/potential-buffer-overflow):
- https://cwe.mitre.org/data/definitions/676.html
CodeQL alert:
- Line 1612 in MdeModulePkg/Universal/SmbiosDxe/SmbiosDxe.c
- Type: Pointer overflow check
- Severity: Low
- Problem: Range check relying on pointer overflow
Cc: Dandan Bi <dandan.bi@intel.com>
Cc: Erich McMillan <emcmillan@microsoft.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Michael Kubacki <mikuback@linux.microsoft.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Zhichao Gao <zhichao.gao@intel.com>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Co-authored-by: Michael Kubacki <michael.kubacki@microsoft.com>
Signed-off-by: Erich McMillan <emcmillan@microsoft.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
---
MdeModulePkg/Universal/SmbiosDxe/SmbiosDxe.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/MdeModulePkg/Universal/SmbiosDxe/SmbiosDxe.c b/MdeModulePkg/Universal/SmbiosDxe/SmbiosDxe.c
index 1d43adc7662c..dd077bb0cf19 100644
--- a/MdeModulePkg/Universal/SmbiosDxe/SmbiosDxe.c
+++ b/MdeModulePkg/Universal/SmbiosDxe/SmbiosDxe.c
@@ -1608,9 +1608,7 @@ ParseAndAddExistingSmbiosTable (
//
// Make sure not to access memory beyond SmbiosEnd
//
- if ((Smbios.Raw + sizeof (SMBIOS_STRUCTURE) > SmbiosEnd.Raw) ||
- (Smbios.Raw + sizeof (SMBIOS_STRUCTURE) < Smbios.Raw))
- {
+ if ((UINTN)(SmbiosEnd.Raw - Smbios.Raw) < sizeof (SMBIOS_STRUCTURE)) {
return EFI_INVALID_PARAMETER;
}
@@ -1625,9 +1623,7 @@ ParseAndAddExistingSmbiosTable (
// Make sure not to access memory beyond SmbiosEnd
// Each structure shall be terminated by a double-null (0000h).
//
- if ((Smbios.Raw + Smbios.Hdr->Length + 2 * sizeof (UINT8) > SmbiosEnd.Raw) ||
- (Smbios.Raw + Smbios.Hdr->Length + 2 * sizeof (UINT8) < Smbios.Raw))
- {
+ if ((UINTN)(SmbiosEnd.Raw - Smbios.Raw) < (Smbios.Hdr->Length + 2U)) {
return EFI_INVALID_PARAMETER;
}
--
2.40.0.windows.1
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