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| author |   Mitko Haralanov <mitko.haralanov@intel.com> | 2016-03-08 11:14:31 -0800 |
|---|---|---|
| committer |   Doug Ledford <dledford@redhat.com> | 2016-03-21 15:55:20 -0400 |
| commit | 4b00d9490f2147d29f107f36391b0cc77bcd944f (patch) | |
| tree | e775eae8cb7c750a608aea9dd4e5a5f6b979df0d /drivers/staging/rdma | |
| parent | IB/hfi1: Allow MMU function execution in IRQ context (diff) | |
| download | linux-dev-4b00d9490f2147d29f107f36391b0cc77bcd944f.tar.xz linux-dev-4b00d9490f2147d29f107f36391b0cc77bcd944f.zip | |
IB/hfi1: Prevent NULL pointer dereference
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>
Diffstat (limited to 'drivers/staging/rdma')
| -rw-r--r-- | drivers/staging/rdma/hfi1/mmu_rb.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/staging/rdma/hfi1/mmu_rb.c b/drivers/staging/rdma/hfi1/mmu_rb.c index 648f7e0a1d17..f42a33b55dc4 100644 --- a/drivers/staging/rdma/hfi1/mmu_rb.c +++ b/drivers/staging/rdma/hfi1/mmu_rb.c @@ -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); |