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IB/hfi1: Prevent NULL pointer dereference

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Prevent a potential NULL pointer dereference (found
by code inspection) when unregistering an MMU handler.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Mitko Haralanov <mitko.haralanov@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Mitko Haralanov
2016-03-08 11:14:31 -08:00
committed by Doug Ledford
parent c81e1f6452
commit 4b00d9490f
1 changed files with 3 additions and 0 deletions
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3
drivers/staging/rdma/hfi1/mmu_rb.c
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@@ -107,6 +107,9 @@ void hfi1_mmu_rb_unregister(struct rb_root *root)
struct mmu_rb_handler *handler = find_mmu_handler(root);
unsigned long flags;
if (!handler)
return;
spin_lock_irqsave(&mmu_rb_lock, flags);
list_del(&handler->list);
spin_unlock_irqrestore(&mmu_rb_lock, flags);