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ParseCert: check index in DecodeSubtree before accessing tag

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This commit is contained in:
Sean Parkinson
2022-01-24 12:30:48 +10:00
parent 198843aa34
commit 1dd213db76
1 changed files with 6 additions and 0 deletions
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6
wolfcrypt/src/asn.c
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@@ -15968,6 +15968,12 @@ static int DecodeSubtree(const byte* input, int sz, Base_entry** head,
WOLFSSL_MSG("\tfail: should be a SEQUENCE"); WOLFSSL_MSG("\tfail: should be a SEQUENCE");
return ASN_PARSE_E; return ASN_PARSE_E;
} }
if (idx >= (word32)sz) {
WOLFSSL_MSG("\tfail: expecting tag");
return ASN_PARSE_E;
}
nameIdx = idx; nameIdx = idx;
b = input[nameIdx++]; b = input[nameIdx++];