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Miller" , Jakub Kicinski , Jesper Dangaard Brouer , John Fastabend , Martin KaFai Lau , Song Liu , Yonghong Song , Andrii Nakryiko , KP Singh , netdev@vger.kernel.org (open list:XDP (eXpress Data Path)), bpf@vger.kernel.org (open list:XDP (eXpress Data Path)), linux-kernel@vger.kernel.org (open list) Subject: [PATCH] xdp_rxq_info_user: Add null check after malloc Date: Tue, 9 Jun 2020 23:01:36 -0400 Message-Id: <20200610030145.17263-1-gaurav1086@gmail.com> X-Mailer: git-send-email 2.17.1 Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Signed-off-by: Gaurav Singh 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