rcutorture: Check nfakewriters parameter
Currently, a negative value for rcutorture.nfakewriters= can cause rcutorture to pass a negative size to the memory allocator, which is not really a particularly good thing to do. This commit therefore adds bounds checking to this parameter, so that values that are less than or equal to zero disable fake writing. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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@ -1786,12 +1786,15 @@ rcu_torture_init(void)
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writer_task);
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if (firsterr)
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goto unwind;
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fakewriter_tasks = kzalloc(nfakewriters * sizeof(fakewriter_tasks[0]),
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GFP_KERNEL);
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if (fakewriter_tasks == NULL) {
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VERBOSE_TOROUT_ERRSTRING("out of memory");
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firsterr = -ENOMEM;
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goto unwind;
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if (nfakewriters > 0) {
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fakewriter_tasks = kzalloc(nfakewriters *
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sizeof(fakewriter_tasks[0]),
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GFP_KERNEL);
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if (fakewriter_tasks == NULL) {
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VERBOSE_TOROUT_ERRSTRING("out of memory");
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firsterr = -ENOMEM;
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goto unwind;
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}
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}
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for (i = 0; i < nfakewriters; i++) {
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firsterr = torture_create_kthread(rcu_torture_fakewriter,
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