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check i2d_ASN1_TYPE return value

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add a length check to the return value of function i2d_ASN1_TYPE. Return an error instead of trying to malloc a negative number.

CLA: trivial

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14828)
This commit is contained in:
bonniegong 2021-04-12 10:43:13 +08:00 committed by Pauli
parent c4005c8b84
commit c65abf2213
1 changed files with 2 additions and 0 deletions
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2
crypto/asn1/a_strex.c
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@ -280,6 +280,8 @@ static int do_dump(unsigned long lflags, char_io *io_ch, void *arg,
t.type = str->type;
t.value.ptr = (char *)str;
der_len = i2d_ASN1_TYPE(&t, NULL);
if (der_len <= 0)
return -1;
if ((der_buf = OPENSSL_malloc(der_len)) == NULL) {
ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
return -1;