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asn1: Empty bit string requires empty zero-bits indicator

This commit is contained in:
Jakub Jelen 2019-11-06 17:56:29 +01:00
parent 3af6d7999e
commit 8ddfafe057
1 changed files with 4 additions and 0 deletions
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4
src/libopensc/asn1.c
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@ -577,6 +577,10 @@ static int decode_bit_string(const u8 * inbuf, size_t inlen, void *outbuf,
if (inlen < 1)
return SC_ERROR_INVALID_ASN1_OBJECT;
/* 8.6.2.3 If the bitstring is empty, there shall be no subsequent octets,
* and the initial octet shall be zero. */
if (inlen == 1 && *in != 0)
return SC_ERROR_INVALID_ASN1_OBJECT;
/* ITU-T Rec. X.690 8.6.2.2: The number shall be in the range zero to seven. */
if ((*in & ~0x07) != 0)
return SC_ERROR_INVALID_ASN1_OBJECT;