On Thu, Jul 16, 2020 at 03:38:56PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>
> Currently in the unlikely event that buf fails to be allocated it
> is dereferenced a few times. Use the errexit flag to determine if
> buf should be written to to avoid the null pointer dereferences.
>
> Addresses-Coverity: ("Dereference after null check")
> Fixes: f518f154ecef ("refperf: Dynamically allocate experiment-summary output buffer")
> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Good catch, applied, thank you!
Thanx, Paul
> ---
> kernel/rcu/refscale.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/kernel/rcu/refscale.c b/kernel/rcu/refscale.c
> index d9291f883b54..952595c678b3 100644
> --- a/kernel/rcu/refscale.c
> +++ b/kernel/rcu/refscale.c
> @@ -546,9 +546,11 @@ static int main_func(void *arg)
> // Print the average of all experiments
> SCALEOUT("END OF TEST. Calculating average duration per loop (nanoseconds)...\n");
>
> - buf[0] = 0;
> - strcat(buf, "\n");
> - strcat(buf, "Runs\tTime(ns)\n");
> + if (!errexit) {
> + buf[0] = 0;
> + strcat(buf, "\n");
> + strcat(buf, "Runs\tTime(ns)\n");
> + }
>
> for (exp = 0; exp < nruns; exp++) {
> u64 avg;
> --
> 2.27.0
>
