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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-05-14 15:42:40 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-07-15 14:47:15 -0700 |
| commit | 4444d852a99b8f0310f369da8473ec3639e380a7 (patch) | |
| tree | cdc5c247b4782a57c7c041d66e9e7fb9984157ad | |
| parent | d9eba768839ac24e47606af36e50c14f10c2211c (diff) | |
| download | linux-4444d852a99b8f0310f369da8473ec3639e380a7.tar.bz2 | |
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>
| -rw-r--r-- | kernel/rcu/rcutorture.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 7e29a3266139..2cbe569ac5dd 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -1786,12 +1786,15 @@ rcu_torture_init(void) writer_task); if (firsterr) goto unwind; - fakewriter_tasks = kzalloc(nfakewriters * sizeof(fakewriter_tasks[0]), - GFP_KERNEL); - if (fakewriter_tasks == NULL) { - VERBOSE_TOROUT_ERRSTRING("out of memory"); - firsterr = -ENOMEM; - goto unwind; + if (nfakewriters > 0) { + fakewriter_tasks = kzalloc(nfakewriters * + sizeof(fakewriter_tasks[0]), + GFP_KERNEL); + if (fakewriter_tasks == NULL) { + VERBOSE_TOROUT_ERRSTRING("out of memory"); + firsterr = -ENOMEM; + goto unwind; + } } for (i = 0; i < nfakewriters; i++) { firsterr = torture_create_kthread(rcu_torture_fakewriter, |