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-rw-r--r--usr.sbin/mrouted/mapper.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/usr.sbin/mrouted/mapper.c b/usr.sbin/mrouted/mapper.c
index 0f09835..8fdbad0 100644
--- a/usr.sbin/mrouted/mapper.c
+++ b/usr.sbin/mrouted/mapper.c
@@ -943,6 +943,8 @@ int main(argc, argv)
struct timeval tv;
int count, recvlen, dummy = 0;
+ if (igmp_socket >= FD_SETSIZE)
+ log(LOG_ERR, 0, "descriptor too big");
FD_ZERO(&fds);
FD_SET(igmp_socket, &fds);
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