tree 71138623e144edd910490f327696b546e14f7d67
parent 51eeb6ebc94d965768143c45e9f39b0a7998bdbd
author Rich Felker <dalias@aerifal.cx> 1463957399 -0400
committer Rich Felker <dalias@aerifal.cx> 1463957399 -0400

fix undefined pointer arithmetic in CMSG_NXTHDR macro

previously, the only way the stopping condition could be met with
correct lengths in the headers invoked undefined behavior, adding
sizeof(struct cmsghdr) beyond the end of the cmsg buffer.

instead, compute and compare sizes rather than pointers.