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Code Issues Releases Wiki Activity

Prevent out of bounds (4)

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M66B 2019-12-19 15:27:06 +01:00
parent e98d5ef6a9
commit 81c8320dff
1 changed files with 1 additions and 1 deletions
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2
app/src/main/jni/netguard/dns.c
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@ -34,7 +34,7 @@ int32_t get_qname(const uint8_t *data, const size_t datalen, uint16_t off, char
if (count++ > 25)
break;
if (len & 0xC0) {
if (ptr + 1 < datalen && (len & 0xC0)) {
uint16_t jump = (uint16_t) ((len & 0x3F) * 256 + *(data + ptr + 1));
if (jump >= datalen) {
log_android(ANDROID_LOG_DEBUG, "DNS invalid jump");