Re: [Qemu-devel] [PATCH 1/1] hw/9pfs: Fix memory leak in error path

["Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>]

"M. Mohan Kumar" <mohan@in.ibm.com> writes:

> From: "M. Mohan Kumar" <mohan@in.ibm.com>
>
> Fix few more memory leaks in virtio-9p-device.c detected using valgrind.
>
> Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
> ---
>  hw/9pfs/virtio-9p-device.c | 26 +++++++++++++++++---------
>  1 file changed, 17 insertions(+), 9 deletions(-)
>
> diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
> index dc6f4e4..35e2af4 100644
> --- a/hw/9pfs/virtio-9p-device.c
> +++ b/hw/9pfs/virtio-9p-device.c
> @@ -68,14 +68,14 @@ static int virtio_9p_device_init(VirtIODevice *vdev)
>          fprintf(stderr, "Virtio-9p device couldn't find fsdev with the "
>                  "id = %s\n",
>                  s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL");
> -        return -1;
> +        goto out;
>      }
>
>      if (!s->fsconf.tag) {
>          /* we haven't specified a mount_tag */
>          fprintf(stderr, "fsdev with id %s needs mount_tag arguments\n",
>                  s->fsconf.fsdev_id);
> -        return -1;
> +        goto out;
>      }
>
>      s->ctx.export_flags = fse->export_flags;
> @@ -85,10 +85,10 @@ static int virtio_9p_device_init(VirtIODevice *vdev)
>      if (len > MAX_TAG_LEN - 1) {
>          fprintf(stderr, "mount tag '%s' (%d bytes) is longer than "
>                  "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1);
> -        return -1;
> +        goto out;
>      }
>
> -    s->tag = strdup(s->fsconf.tag);
> +    s->tag = g_strdup(s->fsconf.tag);
>      s->ctx.uid = -1;
>
>      s->ops = fse->ops;
> @@ -99,11 +99,11 @@ static int virtio_9p_device_init(VirtIODevice *vdev)
>      if (s->ops->init(&s->ctx) < 0) {
>          fprintf(stderr, "Virtio-9p Failed to initialize fs-driver with id:%s"
>                  " and export path:%s\n", s->fsconf.fsdev_id, s->ctx.fs_root);
> -        return -1;
> +        goto out;
>      }
>      if (v9fs_init_worker_threads() < 0) {
>          fprintf(stderr, "worker thread initialization failed\n");
> -        return -1;
> +        goto out;
>      }
>
>      /*
> @@ -115,18 +115,26 @@ static int virtio_9p_device_init(VirtIODevice *vdev)
>      if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) {
>          fprintf(stderr,
>                  "error in converting name to path %s", strerror(errno));
> -        return -1;
> +        goto out;
>      }
>      if (s->ops->lstat(&s->ctx, &path, &stat)) {
>          fprintf(stderr, "share path %s does not exist\n", fse->path);
> -        return -1;
> +        goto out;
>      } else if (!S_ISDIR(stat.st_mode)) {
>          fprintf(stderr, "share path %s is not a directory\n", fse->path);
> -        return -1;
> +        goto out;
>      }
>      v9fs_path_free(&path);
>
>      return 0;
> +out:
> +    g_free(s->ctx.fs_root);
> +    g_free(s->tag);
> +    virtio_cleanup(vdev);
> +    v9fs_path_free(&path);
> +
> +    return -1;
> +
>  }
>

The error path will result in qemu terminating right ? Do we care about
g_free in those case ?

-aneesh