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SubjectRe: [PATCH] inotify: add error handling for kmem_cache_create
in __kmem_cache_create->kmem_cache_open

with SLAB_PANIC, kernel will panic if it fail

On Tue, Jun 12, 2018 at 3:41 PM, cgxu519@gmx.com <cgxu519@gmx.com> wrote:
>
>> 在 2018年6月12日,下午12:22,Zhouyang Jia <jiazhouyang09@gmail.com> 写道:
>>
>> When kmem_cache_create fails, the lack of error-handling code may
>> cause unexpected results.
>>
>> This patch adds error-handling code after calling kmem_cache_create.
>
> I think SLAB_PANIC can handle this case.
>
> Thanks,
> Chengguang.
>
>>
>> Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
>> ---
>> fs/notify/inotify/inotify_user.c | 2 ++
>> 1 file changed, 2 insertions(+)
>>
>> diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
>> index ef32f36..0704bab 100644
>> --- a/fs/notify/inotify/inotify_user.c
>> +++ b/fs/notify/inotify/inotify_user.c
>> @@ -805,6 +805,8 @@ static int __init inotify_user_setup(void)
>> BUG_ON(hweight32(ALL_INOTIFY_BITS) != 21);
>>
>> inotify_inode_mark_cachep = KMEM_CACHE(inotify_inode_mark, SLAB_PANIC);
>> + if (!inotify_inode_mark_cachep)
>> + return -ENOMEM;
>>
>> inotify_max_queued_events = 16384;
>> init_user_ns.ucount_max[UCOUNT_INOTIFY_INSTANCES] = 128;
>> --
>> 2.7.4
>>
>



--
Best regards
Kassey

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