[PATCH 01/16] IB/hfi1: Prevent null pointer dereference
From: <hidden>
Date: 2016-07-28 19:21:12
Subsystem:
infiniband subsystem, the rest · Maintainers:
Jason Gunthorpe, Leon Romanovsky, Linus Torvalds
From: Ira Weiny <redacted> If a context has not been assigned or assignment failed, pq may be NULL. Move the unregister within the protection of the null check. Reviewed-by: Dean Luick <redacted> Signed-off-by: Ira Weiny <redacted> --- drivers/infiniband/hw/hfi1/user_sdma.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/infiniband/hw/hfi1/user_sdma.c b/drivers/infiniband/hw/hfi1/user_sdma.c
index 586f07807b27..6b8d1e8b6286 100644
--- a/drivers/infiniband/hw/hfi1/user_sdma.c
+++ b/drivers/infiniband/hw/hfi1/user_sdma.c@@ -472,8 +472,8 @@ int hfi1_user_sdma_free_queues(struct hfi1_filedata *fd) hfi1_cdbg(SDMA, "[%u:%u:%u] Freeing user SDMA queues", uctxt->dd->unit, uctxt->ctxt, fd->subctxt); pq = fd->pq; - hfi1_mmu_rb_unregister(&pq->sdma_rb_root); if (pq) { + hfi1_mmu_rb_unregister(&pq->sdma_rb_root); spin_lock_irqsave(&uctxt->sdma_qlock, flags); if (!list_empty(&pq->list)) list_del_init(&pq->list);
--
1.8.2
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