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@xxxxxxxxxxxxxxxxxx>
> ---
> 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 ?
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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