Re: [PATCH net 1/2] selftests: tls: clean up uninitialized warnings

A bunch of tests uses uninitialized stack memory as random
data to send. This is harmless but generates compiler warnings.
Explicitly init the buffers with random data.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
  tools/testing/selftests/net/tls.c | 20 ++++++++++++++++++++
  1 file changed, 20 insertions(+)

diff --git a/tools/testing/selftests/net/tls.c b/tools/testing/selftests/net/tls.c
index 426d07875a48..58fea6eb588d 100644
--- a/tools/testing/selftests/net/tls.c
+++ b/tools/testing/selftests/net/tls.c

@@ -25,6 +25,18 @@
  #define TLS_PAYLOAD_MAX_LEN 16384
  #define SOL_TLS 282
  
+static void memrnd(void *s, size_t n)
+{
+	int *dword = s;
+	char *byte;
+
+	for (; n >= 4; n -= 4)
+		*dword++ = rand();
+	byte = (void *)dword;
+	while (n--)
+		*byte++ = rand();
+}
+
  FIXTURE(tls_basic)
  {
  	int fd, cfd;

@@ -308,6 +320,8 @@ TEST_F(tls, recv_max)
  	char recv_mem[TLS_PAYLOAD_MAX_LEN];
  	char buf[TLS_PAYLOAD_MAX_LEN];
  
+	memrnd(buf, sizeof(buf));
+
  	EXPECT_GE(send(self->fd, buf, send_len, 0), 0);
  	EXPECT_NE(recv(self->cfd, recv_mem, send_len, 0), -1);
  	EXPECT_EQ(memcmp(buf, recv_mem, send_len), 0);

@@ -588,6 +602,8 @@ TEST_F(tls, recvmsg_single_max)
  	struct iovec vec;
  	struct msghdr hdr;
  
+	memrnd(send_mem, sizeof(send_mem));
+
  	EXPECT_EQ(send(self->fd, send_mem, send_len, 0), send_len);
  	vec.iov_base = (char *)recv_mem;
  	vec.iov_len = TLS_PAYLOAD_MAX_LEN;

@@ -610,6 +626,8 @@ TEST_F(tls, recvmsg_multiple)
  	struct msghdr hdr;
  	int i;
  
+	memrnd(buf, sizeof(buf));
+
  	EXPECT_EQ(send(self->fd, buf, send_len, 0), send_len);
  	for (i = 0; i < msg_iovlen; i++) {
  		iov_base[i] = (char *)malloc(iov_len);

@@ -634,6 +652,8 @@ TEST_F(tls, single_send_multiple_recv)
  	char send_mem[TLS_PAYLOAD_MAX_LEN * 2];
  	char recv_mem[TLS_PAYLOAD_MAX_LEN * 2];
  
+	memrnd(send_mem, sizeof(send_mem));
+
  	EXPECT_GE(send(self->fd, send_mem, total_len, 0), 0);
  	memset(recv_mem, 0, total_len);