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check DER long-form length bounds in mg_der_to_tlv #3579

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alhudz wants to merge 1 commit into from
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check DER long-form length bounds in mg_der_to_tlv #3579

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1 change: 1 addition & 0 deletions mongoose.c
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Original file line number Diff line number Diff line change
Expand Up @@ -15526,6 +15526,7 @@ static int mg_der_to_tlv(uint8_t *der, size_t dersz, struct mg_der_tlv *tlv) {
tlv->value = der + 2;
if (tlv->len > 0x7f) {
uint32_t i, n = tlv->len - 0x80;
if (dersz < (size_t) (2 + n)) return -1;
tlv->len = 0;
for (i = 0; i < n; i++) {
tlv->len = (tlv->len << 8) | (der[2 + i]);
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1 change: 1 addition & 0 deletions src/tls_builtin.c
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Expand Up @@ -249,6 +249,7 @@ static int mg_der_to_tlv(uint8_t *der, size_t dersz, struct mg_der_tlv *tlv) {
tlv->value = der + 2;
if (tlv->len > 0x7f) {
uint32_t i, n = tlv->len - 0x80;
if (dersz < (size_t) (2 + n)) return -1;
tlv->len = 0;
for (i = 0; i < n; i++) {
tlv->len = (tlv->len << 8) | (der[2 + i]);
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