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SubjectRe: [PATCH SLUB 1/2] duplicate the cache name in saved_alias list
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On Mon, 2012-06-25 at 18:54 +0800, Wanlong Gao wrote:
> On 06/25/2012 05:53 PM, Li Zhong wrote:
> > SLUB duplicates the cache name in kmem_cache_create(). However if the
> > cache could be merged to others during early booting, the name pointer
> > is saved in saved_alias list, and the string needs to be kept valid
> > before slab_sysfs_init() is called.
> >
> > This patch tries to duplicate the cache name in saved_alias list, so
> > that the cache name could be safely kfreed after calling
> > kmem_cache_create(), if that name is kmalloced.
> >
> > Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
> > ---
> > mm/slub.c | 6 ++++++
> > 1 files changed, 6 insertions(+), 0 deletions(-)
> >
> > diff --git a/mm/slub.c b/mm/slub.c
> > index 8c691fa..3dc8ed5 100644
> > --- a/mm/slub.c
> > +++ b/mm/slub.c
> > @@ -5373,6 +5373,11 @@ static int sysfs_slab_alias(struct kmem_cache *s,
> > const char *name)
> >
> > al->s = s;
> > al->name = name;
> > + al->name = kstrdup(name, GFP_KERNEL);
>
> dup assigned the al->name ?
>

Ah, yes, there should be a '-' before the line al->name = name;

Thank you, I will update it.

> Thanks,
> Wanlong Gao
>
> > + if (!al->name) {
> > + kfree(al);
> > + return -ENOMEM;
> > + }
> > al->next = alias_list;
> > alias_list = al;
> > return 0;
> > @@ -5409,6 +5414,7 @@ static int __init slab_sysfs_init(void)
> > if (err)
> > printk(KERN_ERR "SLUB: Unable to add boot slab alias"
> > " %s to sysfs\n", s->name);
> > + kfree(al->name);
> > kfree(al);
> > }
> >
> >
>
>
> --
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