Re: [PATCH] RDMA/rxe: Use kzalloc() to alloc map_set

"Li, Zhijian" <lizhijian@xxxxxxxxxxx> · Mon, 23 May 2022 22:02:56 +0800

on 2022/5/20 22:45, Jason Gunthorpe wrote:
On Wed, May 18, 2022 at 12:37:25PM +0800, Li Zhijian wrote:
Below call chains will alloc map_set without fully initializing map_set.
rxe_mr_init_fast()
  -> rxe_mr_alloc()
     -> rxe_mr_alloc_map_set()

Uninitialized values inside struct rxe_map_set are possible to cause
kernel panic.
If the value is uninitialized then why is 0 an OK value?

Would be happier to know the exact value that is not initialized

Well, good question. After re-think of this issue, it seems this patch 
wasn't the root cause though it made the crash disappear in some extent.

I'm still working on the root cause :)

Thanks

Zhijian

Jason