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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-05-14 15:42:40 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-07-15 14:47:15 -0700
commit4444d852a99b8f0310f369da8473ec3639e380a7 (patch)
treecdc5c247b4782a57c7c041d66e9e7fb9984157ad /kernel/rcu
parentd9eba768839ac24e47606af36e50c14f10c2211c (diff)
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>
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/rcutorture.c15
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,