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x509asn1: make encodeOID stop on too long input

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Plus a minor fixup.

Reported-by: John Rodriguez

Closes #20871
This commit is contained in:
Daniel Stenberg 2026-03-09 20:16:32 +01:00
parent df5c6b6f54
commit 248dd9e55f
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GPG key ID: 5CC908FDB71E12C2
1 changed files with 9 additions and 2 deletions
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11
lib/vtls/x509asn1.c
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@ -443,6 +443,8 @@ static CURLcode encodeOID(struct dynbuf *store,
do {
if(x & 0xFF000000)
return CURLE_OK;
else if(beg == end)
return CURLE_BAD_FUNCTION_ARGUMENT;
y = *(const unsigned char *)beg++;
x = (x << 7) | (y & 0x7F);
} while(y & 0x80);
@ -473,8 +475,8 @@ static CURLcode OID2str(struct dynbuf *store,
result = curlx_dyn_add(store, op->textoid);
else
result = curlx_dyn_add(store, curlx_dyn_ptr(&buf));
curlx_dyn_free(&buf);
}
curlx_dyn_free(&buf);
}
else
result = encodeOID(store, beg, end);
@ -979,7 +981,12 @@ static int do_pubkey(struct Curl_easy *data, int certnum, const char *algo,
* ECC public key is all the data, a value of type BIT STRING mapped to
* OCTET STRING and should not be parsed as an ASN.1 value.
*/
const size_t len = ((pubkey->end - pubkey->beg - 2) * 4);
const size_t dlen = pubkey->end - pubkey->beg;
size_t len;
if(dlen < 2)
/* too small */
return 1;
len = (dlen - 2) * 4;
if(!certnum)
infof(data, " ECC Public Key (%zu bits)", len);
if(data->set.ssl.certinfo) {