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[posix-app] fix aliasing issue (#3579)

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This commit is contained in:
Yakun Xu
2019-02-11 13:03:26 -08:00
committed by Jonathan Hui
parent cced005256
commit 9bd0467b6f
1 changed files with 5 additions and 2 deletions
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src/posix/platform/udp.cpp
+5 -2
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@@ -114,11 +114,13 @@ static otError transmitPacket(int aFd, uint8_t *aPayload, uint16_t aLength, cons
cmsg = CMSG_FIRSTHDR(&msg);
{
int hopLimit = (aMessageInfo.mHopLimit ? aMessageInfo.mHopLimit : -1);
cmsg->cmsg_level = IPPROTO_IPV6;
cmsg->cmsg_type = IPV6_HOPLIMIT;
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
*reinterpret_cast<int *>(CMSG_DATA(cmsg)) = (aMessageInfo.mHopLimit ? aMessageInfo.mHopLimit : -1);
memcpy(CMSG_DATA(cmsg), &hopLimit, sizeof(int));
cmsg = CMSG_NXTHDR(&msg, cmsg);
controlLength += CMSG_SPACE(sizeof(int));
@@ -127,7 +129,7 @@ static otError transmitPacket(int aFd, uint8_t *aPayload, uint16_t aLength, cons
if (!IsMulticast(reinterpret_cast<const struct in6_addr &>(aMessageInfo.mSockAddr)) &&
memcmp(&aMessageInfo.mSockAddr, &in6addr_any, sizeof(aMessageInfo.mSockAddr)))
{
struct in6_pktinfo &pktinfo = *reinterpret_cast<struct in6_pktinfo *>(CMSG_DATA(cmsg));
struct in6_pktinfo pktinfo;
cmsg->cmsg_level = IPPROTO_IPV6;
cmsg->cmsg_type = IPV6_PKTINFO;
@@ -136,6 +138,7 @@ static otError transmitPacket(int aFd, uint8_t *aPayload, uint16_t aLength, cons
pktinfo.ipi6_ifindex = (aMessageInfo.mInterfaceId == OT_NETIF_INTERFACE_ID_THREAD ? sPlatNetifIndex : 0);
memcpy(&pktinfo.ipi6_addr, &aMessageInfo.mSockAddr, sizeof(pktinfo.ipi6_addr));
memcpy(CMSG_DATA(cmsg), &pktinfo, sizeof(pktinfo));
controlLength += CMSG_SPACE(sizeof(pktinfo));
cmsg = CMSG_NXTHDR(&msg, cmsg);