[PATCH 4.9 077/130] samples/bpf: Check the error of write() and read()

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Taeung Song <treeze.tae...@gmail.com>

[ Upstream commit 02a2f000a3629274bfad60bfc4de9edec49e63e7 ]

test_task_rename() and test_urandom_read()
can be failed during write() and read(),
So check the result of them.

Reviewed-by: David Laight <david.lai...@aculab.com>
Signed-off-by: Taeung Song <treeze.tae...@gmail.com>
Acked-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Daniel Borkmann <dan...@iogearbox.net>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 samples/bpf/test_overhead_user.c |   19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

--- a/samples/bpf/test_overhead_user.c
+++ b/samples/bpf/test_overhead_user.c
@@ -6,6 +6,7 @@
  */
 #define _GNU_SOURCE
 #include <sched.h>
+#include <errno.h>
 #include <stdio.h>
 #include <sys/types.h>
 #include <asm/unistd.h>
@@ -44,8 +45,13 @@ static void test_task_rename(int cpu)
                exit(1);
        }
        start_time = time_get_ns();
-       for (i = 0; i < MAX_CNT; i++)
-               write(fd, buf, sizeof(buf));
+       for (i = 0; i < MAX_CNT; i++) {
+               if (write(fd, buf, sizeof(buf)) < 0) {
+                       printf("task rename failed: %s\n", strerror(errno));
+                       close(fd);
+                       return;
+               }
+       }
        printf("task_rename:%d: %lld events per sec\n",
               cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
        close(fd);
@@ -63,8 +69,13 @@ static void test_urandom_read(int cpu)
                exit(1);
        }
        start_time = time_get_ns();
-       for (i = 0; i < MAX_CNT; i++)
-               read(fd, buf, sizeof(buf));
+       for (i = 0; i < MAX_CNT; i++) {
+               if (read(fd, buf, sizeof(buf)) < 0) {
+                       printf("failed to read from /dev/urandom: %s\n", 
strerror(errno));
+                       close(fd);
+                       return;
+               }
+       }
        printf("urandom_read:%d: %lld events per sec\n",
               cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
        close(fd);