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[posix-app] fix aliasing issues in platform UDP (#3591)

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This commit is contained in:
Yakun Xu
2019-02-14 13:26:06 -08:00
committed by Jonathan Hui
parent 5ca9db0035
commit b08fab42bb
1 changed files with 7 additions and 5 deletions
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src/posix/platform/udp.cpp
+7 -5
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@@ -186,18 +186,20 @@ static otError receivePacket(int aFd, uint8_t *aPayload, uint16_t &aLength, otMe
{ {
if (cmsg->cmsg_type == IPV6_HOPLIMIT) if (cmsg->cmsg_type == IPV6_HOPLIMIT)
{ {
int hoplimit = *reinterpret_cast<int *>(CMSG_DATA(cmsg)); int hoplimit;
memcpy(&hoplimit, CMSG_DATA(cmsg), sizeof(hoplimit));
aMessageInfo.mHopLimit = static_cast<uint8_t>(hoplimit); aMessageInfo.mHopLimit = static_cast<uint8_t>(hoplimit);
} }
else if (cmsg->cmsg_type == IPV6_PKTINFO) else if (cmsg->cmsg_type == IPV6_PKTINFO)
{ {
struct in6_pktinfo *pktinfo; struct in6_pktinfo pktinfo;
pktinfo = reinterpret_cast<in6_pktinfo *>(CMSG_DATA(cmsg)); memcpy(&pktinfo, CMSG_DATA(cmsg), sizeof(pktinfo));
aMessageInfo.mInterfaceId = aMessageInfo.mInterfaceId =
(pktinfo->ipi6_ifindex == sPlatNetifIndex ? static_cast<int8_t>(OT_NETIF_INTERFACE_ID_THREAD) : 0); (pktinfo.ipi6_ifindex == sPlatNetifIndex ? static_cast<int8_t>(OT_NETIF_INTERFACE_ID_THREAD) : 0);
memcpy(&aMessageInfo.mSockAddr, &pktinfo->ipi6_addr, sizeof(aMessageInfo.mSockAddr)); memcpy(&aMessageInfo.mSockAddr, &pktinfo.ipi6_addr, sizeof(aMessageInfo.mSockAddr));
} }
} }
} }