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SubjectRe: [PATCH] xdp_rxq_info_user: Add null check after malloc
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On 6/10/20 5:01 AM, Gaurav Singh wrote:
> 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().

The SoB should come after the commit message here.

> ---
> 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);

All these below are candidates for calloc(), can we just use that instead and
simplify the below.

> 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();
>

Thanks,
Daniel

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