> Hi, i noticed this small detail:
>
> + if (strcmp(params->script, "none")) {
> + pid = fork();
> + if (pid == 0) {
> + execl(params->script, params->script,
> net_device.tap_name, NULL);
> + _exit(1);
> + } else {
> + waitpid(pid, &status, 0);
> + if (WIFEXITED(status) && WEXITSTATUS(status) != 0) {
> + warning("Fail to setup tap by %s",
> params->script);
> + goto fail;
> + }
> + }
>
> this path does not seem to have robust error handling: both fork() and
> waitpid() can (and sometimes do) fail. If waitpid() fails then 'status' might
> be ununitialized as well, IIRC.
>
> Thanks,
>
> Ingo
Signed-off-by: Amos Kong <[email protected]>
---
tools/kvm/virtio-net.c | 11 ++++++-----
1 files changed, 6 insertions(+), 5 deletions(-)
diff --git a/tools/kvm/virtio-net.c b/tools/kvm/virtio-net.c
index f8d7276..430769a 100644
--- a/tools/kvm/virtio-net.c
+++ b/tools/kvm/virtio-net.c
@@ -311,13 +311,14 @@ static bool virtio_net__tap_init(const struct
virtio_net_parameters *params)
if (pid == 0) {
execl(params->script, params->script,
net_device.tap_name, NULL);
_exit(1);
- } else {
- waitpid(pid, &status, 0);
- if (WIFEXITED(status) && WEXITSTATUS(status) != 0) {
- warning("Fail to setup tap by %s",
params->script);
- goto fail;
+ } else if (pid > 0) {
+ while(waitpid(pid, &status, 0) != pid) {
}
}
+ if (pid < 0 || (WIFEXITED(status) && WEXITSTATUS(status) != 0))
{
+ warning("Fail to setup tap by %s", params->script);
+ goto fail;
+ }
} else {
memset(&ifr, 0, sizeof(ifr));
--
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