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scftorture: Avoid NULL pointer exception on early exit 

When scftorture finds an error in the module parameters controlling
the relative frequencies of smp_call_function*() variants, it takes an
early exit.  So early that it has not allocated memory to track the
kthreads running the test, which results in a segfault.  This commit
therefore checks for the existence of the memory before attempting
to stop the kthreads that would otherwise have been recorded in that
non-existent memory.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2021-07-09 17:53:27 -07:00
parent 9b9a80677f
commit 586e4d4193
1 changed files with 1 additions and 1 deletions
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2
kernel/scftorture.c
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@ -513,7 +513,7 @@ static void scf_torture_cleanup(void)
return;
WRITE_ONCE(scfdone, true);
if (nthreads)
if (nthreads && scf_stats_p)
for (i = 0; i < nthreads; i++)
torture_stop_kthread("scftorture_invoker", scf_stats_p[i].task);
else