[PATCH] tools/io_uring: Fix missing check for return value of malloc()

[Chenyuan Mi <cymi20@fudan.edu.cn>]

The malloc() function may return NULL when it fails,
which may cause null pointer deference. Add Null 
check for return value of malloc().

Found by our static analysis tool.

Signed-off-by: Chenyuan Mi <cymi20@fudan.edu.cn>
---
 tools/io_uring/io_uring-bench.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/io_uring/io_uring-bench.c b/tools/io_uring/io_uring-bench.c
index 7703f0118385..a7fedfdb9b84 100644
--- a/tools/io_uring/io_uring-bench.c
+++ b/tools/io_uring/io_uring-bench.c
@@ -560,6 +560,11 @@ int main(int argc, char *argv[])
 	pthread_create(&s->thread, NULL, submitter_fn, s);
 
 	fdepths = malloc(8 * s->nr_files);
+	if (!fdepths) {
+		printf("malloc failed");
+		return 1;
+	}
+
 	reap = calls = done = 0;
 	do {
 		unsigned long this_done = 0;
-- 
2.17.1