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Subject[PATCH] IB: fix use-after-free in user verbs cleanup
Hi Andrew,

I'd like to get this into 2.6.13 if possible. If it's too late, it's
not the end of the world -- we can wait for But it's a
tiny, obvious patch that fixes a crash that at least one person
actually hit running a normal application:


Fix a use-after-free bug in userspace verbs cleanup: we can't touch
mr->device after we free mr by calling ib_dereg_mr().

diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -130,13 +130,14 @@ static int ib_dealloc_ucontext(struct ib

list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id);
+ struct ib_device *mrdev = mr->device;
struct ib_umem_object *memobj;

idr_remove(&ib_uverbs_mr_idr, uobj->id);

memobj = container_of(uobj, struct ib_umem_object, uobject);
- ib_umem_release_on_close(mr->device, &memobj->umem);
+ ib_umem_release_on_close(mrdev, &memobj->umem);

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