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[for-next,08/10] IB/hfi1: Use kzalloc() for mmu_rb_handler allocation

Message ID 1617026056-50483-9-git-send-email-dennis.dalessandro@cornelisnetworks.com (mailing list archive)
State Accepted
Delegated to: Jason Gunthorpe
Headers show
Series Fixes for 5.13 | expand

Commit Message

Dennis Dalessandro March 29, 2021, 1:54 p.m. UTC 
From: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>

The code currently assumes that the mmu_notifier struct
embedded in mmu_rb_handler only contains two fields.

There are now extra fields:

struct mmu_notifier {
        struct hlist_node hlist;
        const struct mmu_notifier_ops *ops;
        struct mm_struct *mm;
        struct rcu_head rcu;
        unsigned int users;
};

Given that there in no init for the mmu_notifier, a kzalloc() should
be used to insure that any newly added fields are given a predictable
initial value of zero.

Fixes: 06e0ffa69312 ("IB/hfi1: Re-factor MMU notification code")
Reviewed-by: Adam Goldman <adam.goldman@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
---
 drivers/infiniband/hw/hfi1/mmu_rb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/infiniband/hw/hfi1/mmu_rb.c b/drivers/infiniband/hw/hfi1/mmu_rb.c
index 375a881..dccb4c1 100644
--- a/drivers/infiniband/hw/hfi1/mmu_rb.c
+++ b/drivers/infiniband/hw/hfi1/mmu_rb.c
@@ -89,7 +89,7 @@  int hfi1_mmu_rb_register(void *ops_arg,
 	struct mmu_rb_handler *h;
 	int ret;
 
-	h = kmalloc(sizeof(*h), GFP_KERNEL);
+	h = kzalloc(sizeof(*h), GFP_KERNEL);
 	if (!h)
 		return -ENOMEM;