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system-linux: check ioctl return value in system_if_flags()
[project/netifd.git]
/
system-linux.c
diff --git
a/system-linux.c
b/system-linux.c
index
9933201
..
0b594f6
100644
(file)
--- a/
system-linux.c
+++ b/
system-linux.c
@@
-781,7
+781,9
@@
static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
- ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
+ if (ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr) < 0)
+ return -1;
+
ifr.ifr_flags |= add;
ifr.ifr_flags &= ~rem;
return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
ifr.ifr_flags |= add;
ifr.ifr_flags &= ~rem;
return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);