Re: 回复: [PATCH] mm/slab.c: add node spinlock protect in __cache_free_alien

2020-07-29 Thread David Rientjes
On Wed, 29 Jul 2020, Zhang, Qiang wrote: > > From: Zhang Qiang > > > > We should add node spinlock protect "n->alien" which may be > > assigned to NULL in cpuup_canceled func. cause address access > > exception. > > > > >Hi, do you have an example NULL pointer dereference where you have hit > >t

回复: [PATCH] mm/slab.c: add node spinlock protect in __cache_free_alien

2020-07-28 Thread Zhang, Qiang
发件人: David Rientjes 发送时间: 2020年7月29日 3:46 收件人: Zhang, Qiang 抄送: c...@linux.com; penb...@kernel.org; iamjoonsoo@lge.com; a...@linux-foundation.org; linux...@kvack.org; linux-kernel@vger.kernel.org 主题: Re: [PATCH] mm/slab.c: add node spinlock protect

Re: [PATCH] mm/slab.c: add node spinlock protect in __cache_free_alien

2020-07-28 Thread David Rientjes
On Tue, 28 Jul 2020, qiang.zh...@windriver.com wrote: > From: Zhang Qiang > > We should add node spinlock protect "n->alien" which may be > assigned to NULL in cpuup_canceled func. cause address access > exception. > Hi, do you have an example NULL pointer dereference where you have hit this?

[PATCH] mm/slab.c: add node spinlock protect in __cache_free_alien

2020-07-28 Thread qiang.zhang
From: Zhang Qiang We should add node spinlock protect "n->alien" which may be assigned to NULL in cpuup_canceled func. cause address access exception. Fixes: 18bf854117c6 ("slab: use get_node() and kmem_cache_node() functions") Signed-off-by: Zhang Qiang --- mm/slab.c | 7 +-- 1 file chang