diff options
| author | Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> | 2010-05-27 19:01:58 +0900 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2010-05-27 13:55:13 +0300 |
| commit | d3553a52490dcac54f45083f8fa018e26c22e947 (patch) | |
| tree | 7a9d272840b3e7d106d30b93d71a0c36a3c30790 | |
| parent | 7ad9c9d27048547e96e4e3a13b5780ec6f81bb9f (diff) | |
vhost-net: fix to check the return value of copy_to/from_user() correctly
copy_to/from_user() returns the number of bytes that could not be copied.
So we need to check if it is not zero, and in that case, we should return
the error number -EFAULT rather than directly return the return value from
copy_to/from_user().
Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
| -rw-r--r-- | drivers/vhost/net.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index aa88911c950..0f41c9195e9 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -593,17 +593,17 @@ static long vhost_net_ioctl(struct file *f, unsigned int ioctl, int r; switch (ioctl) { case VHOST_NET_SET_BACKEND: - r = copy_from_user(&backend, argp, sizeof backend); - if (r < 0) - return r; + if (copy_from_user(&backend, argp, sizeof backend)) + return -EFAULT; return vhost_net_set_backend(n, backend.index, backend.fd); case VHOST_GET_FEATURES: features = VHOST_FEATURES; - return copy_to_user(featurep, &features, sizeof features); + if (copy_to_user(featurep, &features, sizeof features)) + return -EFAULT; + return 0; case VHOST_SET_FEATURES: - r = copy_from_user(&features, featurep, sizeof features); - if (r < 0) - return r; + if (copy_from_user(&features, featurep, sizeof features)) + return -EFAULT; if (features & ~VHOST_FEATURES) return -EOPNOTSUPP; return vhost_net_set_features(n, features); |