[PATCH] xdp_rxq_info_user: Add null check after malloc

[Gaurav Singh <gaurav1086@gmail.com>]

Signed-off-by: Gaurav Singh <gaurav1086@gmail.com>

The memset call is made right after malloc call which
can return a NULL pointer upon failure causing a 
segmentation fault. Fix this by adding a null check 
right after malloc() and then do memset().

---
 samples/bpf/xdp_rxq_info_user.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/samples/bpf/xdp_rxq_info_user.c b/samples/bpf/xdp_rxq_info_user.c
index 4fe47502ebed..2d03c84a4cca 100644
--- a/samples/bpf/xdp_rxq_info_user.c
+++ b/samples/bpf/xdp_rxq_info_user.c
@@ -202,11 +202,11 @@ static struct datarec *alloc_record_per_cpu(void)
 
 	size = sizeof(struct datarec) * nr_cpus;
 	array = malloc(size);
-	memset(array, 0, size);
 	if (!array) {
 		fprintf(stderr, "Mem alloc error (nr_cpus:%u)\n", nr_cpus);
 		exit(EXIT_FAIL_MEM);
 	}
+	memset(array, 0, size);
 	return array;
 }
 
@@ -218,11 +218,11 @@ static struct record *alloc_record_per_rxq(void)
 
 	size = sizeof(struct record) * nr_rxqs;
 	array = malloc(size);
-	memset(array, 0, size);
 	if (!array) {
 		fprintf(stderr, "Mem alloc error (nr_rxqs:%u)\n", nr_rxqs);
 		exit(EXIT_FAIL_MEM);
 	}
+	memset(array, 0, size);
 	return array;
 }
 
@@ -233,11 +233,11 @@ static struct stats_record *alloc_stats_record(void)
 	int i;
 
 	rec = malloc(sizeof(*rec));
-	memset(rec, 0, sizeof(*rec));
 	if (!rec) {
 		fprintf(stderr, "Mem alloc error\n");
 		exit(EXIT_FAIL_MEM);
 	}
+	memset(rec, 0, sizeof(*rec));
 	rec->rxq = alloc_record_per_rxq();
 	for (i = 0; i < nr_rxqs; i++)
 		rec->rxq[i].cpu = alloc_record_per_cpu();
-- 
2.17.1