[PATCH net-next v1 7/7] ncdevmem: add test for too many token_count

[Mina Almasry]

Add test for fixed issue: user passing a token with a very large
token_count. Expect an error in this case.

Signed-off-by: Mina Almasry <almasrym...@google.com>
---
 tools/testing/selftests/net/ncdevmem.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tools/testing/selftests/net/ncdevmem.c 
b/tools/testing/selftests/net/ncdevmem.c
index 64d6805381c5..3fd2aee461f3 100644
--- a/tools/testing/selftests/net/ncdevmem.c
+++ b/tools/testing/selftests/net/ncdevmem.c
@@ -391,6 +391,17 @@ int do_server(void)
                                continue;
                        }
 
+                       token.token_start = dmabuf_cmsg->frag_token;
+                       token.token_count = 8192;
+
+                       ret = setsockopt(client_fd, SOL_SOCKET,
+                                        SO_DEVMEM_DONTNEED, &token,
+                                        sizeof(token));
+                       if (ret >= 0)
+                               error(1, 0,
+                                     "DONTNEED of too many frags should have 
failed. ret=%ld\n",
+                                     ret);
+
                        token.token_start = dmabuf_cmsg->frag_token;
                        token.token_count = 1;
 
-- 
2.47.0.163.g1226f6d8fa-goog