[PATCH RESEND 2/2] percpu_ida: Sanity check initialization parameters

[Alexander Gordeev]

Signed-off-by: Alexander Gordeev <agordeev@xxxxxxxxxx>
Cc: Kent Overstreet <kmo@xxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: "Nicholas A. Bellinger" <nab@xxxxxxxxxxxxxxx>
Acked-by: Kent Overstreet <kmo@xxxxxxxxxxxxx>
---
 lib/percpu_ida.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/lib/percpu_ida.c b/lib/percpu_ida.c
index 472ff08..f474f03 100644
--- a/lib/percpu_ida.c
+++ b/lib/percpu_ida.c
@@ -293,6 +293,11 @@ int __percpu_ida_init(struct percpu_ida *pool, unsigned long nr_tags,
 {
 	unsigned i, cpu, order;
 
+	if (batch_size > max_size)
+		return -ERANGE;
+	if (!batch_size)
+		return -EINVAL;
+
 	memset(pool, 0, sizeof(*pool));
 
 	init_waitqueue_head(&pool->wait);
-- 
1.7.7.6

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