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Code Issues Releases Wiki Activity

Prevent out of bounds

This commit is contained in:
M66B 2019-12-18 15:01:55 +01:00
parent 3d6bf8aecd
commit af976e4c30
1 changed files with 4 additions and 1 deletions
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5
app/src/main/jni/netguard/dns.c
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@ -28,7 +28,10 @@ int32_t get_qname(const uint8_t *data, const size_t datalen, uint16_t off, char
uint8_t len = *(data + ptr);
while (len) {
if (len & 0xC0) {
ptr = (uint16_t) ((len & 0x3F) * 256 + *(data + ptr + 1));
uint16_t jump = (uint16_t) ((len & 0x3F) * 256 + *(data + ptr + 1));
if (jump >= datalen)
break;
ptr = jump;
len = *(data + ptr);
log_android(ANDROID_LOG_DEBUG, "DNS qname compression ptr %d len %d", ptr, len);
if (!c) {