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asn1: Avoid malloc(0) also from BIT STRING and GENERALIZED TIME structures

This commit is contained in:
Jakub Jelen 2019-11-07 16:34:24 +01:00 committed by Frank Morgner
parent e50bc29bd9
commit cd51430ba7
1 changed files with 12 additions and 8 deletions
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20
src/libopensc/asn1.c
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@ -1464,10 +1464,12 @@ static int asn1_decode_entry(sc_context_t *ctx,struct sc_asn1_entry *entry,
}
if (entry->flags & SC_ASN1_ALLOC) {
u8 **buf = (u8 **) parm;
*buf = malloc(objlen-1);
if (*buf == NULL) {
r = SC_ERROR_OUT_OF_MEMORY;
break;
if (objlen > 1) {
*buf = malloc(objlen-1);
if (*buf == NULL) {
r = SC_ERROR_OUT_OF_MEMORY;
break;
}
}
*len = objlen-1;
parm = *buf;
@ -1518,10 +1520,12 @@ static int asn1_decode_entry(sc_context_t *ctx,struct sc_asn1_entry *entry,
assert(len != NULL);
if (entry->flags & SC_ASN1_ALLOC) {
u8 **buf = (u8 **) parm;
*buf = malloc(objlen);
if (*buf == NULL) {
r = SC_ERROR_OUT_OF_MEMORY;
break;
if (objlen > 0) {
*buf = malloc(objlen);
if (*buf == NULL) {
r = SC_ERROR_OUT_OF_MEMORY;
break;
}
}
c = *len = objlen;
parm = *buf;