[edk2-devel] [PATCH] CryptoPkg: Check ASN1_get_object() return value

["Sountharya N via groups.io" <sountharyan=ami.com@groups.io>]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4509

In ASN1_get_object(), Inf should compare with 0x80 instead of 0x00.

Cc: Sountharya N <sountharyan@ami.com>

Signed-off-by: Sountharya N <sountharyan@ami.com>
---
 CryptoPkg/Library/BaseCryptLib/Pk/CryptX509.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/CryptoPkg/Library/BaseCryptLib/Pk/CryptX509.c b/CryptoPkg/Library/BaseCryptLib/Pk/CryptX509.c
index 1182323b63..021cc328f8 100644
--- a/CryptoPkg/Library/BaseCryptLib/Pk/CryptX509.c
+++ b/CryptoPkg/Library/BaseCryptLib/Pk/CryptX509.c
@@ -839,17 +839,17 @@ X509GetTBSCert (
   Length = 0;

   Inf    = ASN1_get_object (&Temp, (long *)&Length, (int *)&Asn1Tag, (int *)&ObjClass, (long)CertSize);



-  if (((Inf & 0x80) == 0x00) && (Asn1Tag != V_ASN1_SEQUENCE)) {

+  if (((Inf & 0x80) == 0x80) || (Asn1Tag != V_ASN1_SEQUENCE)) {

     return FALSE;

   }



   *TBSCert = (UINT8 *)Temp;



-  ASN1_get_object (&Temp, (long *)&Length, (int *)&Asn1Tag, (int *)&ObjClass, (long)Length);

+  Inf = ASN1_get_object (&Temp, (long *)&Length, (int *)&Asn1Tag, (int *)&ObjClass, (long)Length);

   //

   // Verify the parsed TBSCertificate is one correct SEQUENCE data.

   //

-  if (((Inf & 0x80) == 0x00) && (Asn1Tag != V_ASN1_SEQUENCE)) {

+  if (((Inf & 0x80) == 0x80) || (Asn1Tag != V_ASN1_SEQUENCE)) {

     return FALSE;

   }



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