ifdown: use /var/run/udhcpc.%iface%.pid only if it exists

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/networking/ifupdown.c b/networking/ifupdown.c
index bf88b1c19..2f3dd1d7b 100644
--- a/networking/ifupdown.c
+++ b/networking/ifupdown.c
@@ -573,8 +573,10 @@ static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd, execfn *exec)
 static int FAST_FUNC dhcp_down(struct interface_defn_t *ifd, execfn *exec)
 {
         int result;
-        result = execute("kill "
-                       "`cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
+        result = execute(
+                "test -f /var/run/udhcpc.%iface%.pid && "
+                "kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
+                ifd, exec);
         /* Also bring the hardware interface down since
            killing the dhcp client alone doesn't do it.
            This enables consecutive ifup->ifdown->ifup */