vsock_addr: Check for supported flag values

Check if the provided flags value from the vsock address data structure
includes the supported flags in the corresponding kernel version.

The first byte of the "svm_zero" field is used as "svm_flags", so add
the flags check instead.

Changelog

v3 -> v4

* New patch in v4.

Signed-off-by: Andra Paraschiv <andraprs@amazon.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/vmw_vsock/vsock_addr.c b/net/vmw_vsock/vsock_addr.c
index 909de26cb0e707c4b70fdf72c33d1da9cbb15681..223b9660a759f69791464a1a7b88e597ccb16e44 100644 (file)
--- a/net/vmw_vsock/vsock_addr.c
+++ b/net/vmw_vsock/vsock_addr.c
@@ -22,13 +22,15 @@ EXPORT_SYMBOL_GPL(vsock_addr_init);
 
 int vsock_addr_validate(const struct sockaddr_vm *addr)
 {
+       __u8 svm_valid_flags = VMADDR_FLAG_TO_HOST;
+
        if (!addr)
                return -EFAULT;
 
        if (addr->svm_family != AF_VSOCK)
                return -EAFNOSUPPORT;
 
-       if (addr->svm_zero[0] != 0)
+       if (addr->svm_flags & ~svm_valid_flags)
                return -EINVAL;
 
        return 0;