On Thu, 11 Jun 2020 11:02:21 -0400
Gaurav Singh <gaurav1086@xxxxxxxxx> wrote:
> Replace malloc/memset with calloc
Please also mention/describe that this also solves the bug you found.
As this fix a potential bug, it will be appropriate to add a "Fixes:"
line, just before "Signed-off-by" (meaning no newline between the two).
Fixes: 0fca931a6f21 ("samples/bpf: program demonstrating access to xdp_rxq_info")
> Signed-off-by: Gaurav Singh <gaurav1086@xxxxxxxxx>
> ---
> samples/bpf/xdp_rxq_info_user.c | 13 +++----------
> 1 file changed, 3 insertions(+), 10 deletions(-)
>
> diff --git a/samples/bpf/xdp_rxq_info_user.c b/samples/bpf/xdp_rxq_info_user.c
> index 4fe47502ebed..caa4e7ffcfc7 100644
> --- a/samples/bpf/xdp_rxq_info_user.c
> +++ b/samples/bpf/xdp_rxq_info_user.c
> @@ -198,11 +198,8 @@ static struct datarec *alloc_record_per_cpu(void)
> {
> unsigned int nr_cpus = bpf_num_possible_cpus();
> struct datarec *array;
> - size_t size;
>
> - size = sizeof(struct datarec) * nr_cpus;
> - array = malloc(size);
> - memset(array, 0, size);
> + array = calloc(nr_cpus, sizeof(struct datarec));
> if (!array) {
> fprintf(stderr, "Mem alloc error (nr_cpus:%u)\n", nr_cpus);
> exit(EXIT_FAIL_MEM);
> @@ -214,11 +211,8 @@ static struct record *alloc_record_per_rxq(void)
> {
> unsigned int nr_rxqs = bpf_map__def(rx_queue_index_map)->max_entries;
> struct record *array;
> - size_t size;
>
> - size = sizeof(struct record) * nr_rxqs;
> - array = malloc(size);
> - memset(array, 0, size);
> + array = calloc(nr_rxqs, sizeof(struct record));
> if (!array) {
> fprintf(stderr, "Mem alloc error (nr_rxqs:%u)\n", nr_rxqs);
> exit(EXIT_FAIL_MEM);
> @@ -232,8 +226,7 @@ static struct stats_record *alloc_stats_record(void)
> struct stats_record *rec;
> int i;
>
> - rec = malloc(sizeof(*rec));
> - memset(rec, 0, sizeof(*rec));
> + rec = calloc(1, sizeof(struct stats_record));
> if (!rec) {
> fprintf(stderr, "Mem alloc error\n");
> exit(EXIT_FAIL_MEM);
--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
LinkedIn: http://www.linkedin.com/in/brouer
