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--- ./libratbox/src/commio.c.orig 2009-07-11 18:37:37.000000000 +0100
+++ ./libratbox/src/commio.c 2009-07-11 18:37:55.000000000 +0100
@@ -2156,7 +2156,7 @@
if(msg.msg_controllen > 0 && msg.msg_control != NULL
&& (cmsg = CMSG_FIRSTHDR(&msg)) != NULL)
{
- rfds = (msg.msg_controllen - sizeof(struct cmsghdr)) / sizeof(int);
+ rfds = ((unsigned char *)cmsg + cmsg->cmsg_len - CMSG_DATA(cmsg)) / sizeof(int);
for(x = 0; x < nfds && x < rfds; x++)
{
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