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refperf: Avoid null pointer dereference when buf fails to allocate 

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: f518f154ec ("refperf: Dynamically allocate experiment-summary output buffer")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Colin Ian King 2020-07-16 15:38:56 +01:00 committed by Paul E. McKenney
parent 57f602022e
commit 58db5785b0
1 changed files with 5 additions and 3 deletions
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8
kernel/rcu/refscale.c
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@ -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;