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authorStefano Brivio <sbrivio@redhat.com>2021-09-27 00:28:24 +0200
committerStefano Brivio <sbrivio@redhat.com>2021-09-27 01:28:02 +0200
commitf004de4a9d29f65e14a542e42dc40b9628e936d4 (patch)
treed9cbd497407872912d4333ad51ad303fe3a51509 /tap.c
parentf1c1d40f907d4f9a83508b9e7082c60b08d5090c (diff)
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tap: Don't leak file descriptor used to bring up loopback interface
...and while at it, set the socket as non-blocking directly on open(). Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Diffstat (limited to 'tap.c')
-rw-r--r--tap.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/tap.c b/tap.c
index 721ae0c..f395227 100644
--- a/tap.c
+++ b/tap.c
@@ -848,20 +848,25 @@ static int tap_sock_init_tun_ns(void *target_pid)
if (ns_enter(*(int *)target_pid))
goto fail;
- if ((fd = open("/dev/net/tun", O_RDWR)) < 0)
+ if ((fd = open("/dev/net/tun", O_RDWR | O_NONBLOCK)) < 0)
goto fail;
- fcntl(fd, F_SETFL, O_NONBLOCK);
-
tun_ns_fd = fd;
- if (ioctl(socket(AF_INET, SOCK_DGRAM, 0), SIOCSIFFLAGS,
- &((struct ifreq) { .ifr_name = "lo",
- .ifr_flags = IFF_UP }))) {
+ if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+ perror("socket for ioctl");
+ goto fail;
+ }
+
+ if (ioctl(fd, SIOCSIFFLAGS, &((struct ifreq){ .ifr_name = "lo",
+ .ifr_flags = IFF_UP }))) {
perror("SIOCSIFFLAGS ioctl for \"lo\"");
+ close(fd);
goto fail;
}
+ close(fd);
+
return 0;
fail: