From: Miaohe Lin <linmia...@huawei.com> [ Upstream commit cc2205a67dec5a700227a693fc113441e73e4641 ]
In hugetlb_sysfs_add_hstate(), we would do kobject_put() on hstate_kobjs when failed to create sysfs group but forget to set hstate_kobjs to NULL. Then in hugetlb_register_node() error path, we may free it again via hugetlb_unregister_node(). Link: https://lkml.kernel.org/r/20210107123249.36964-1-linmia...@huawei.com Fixes: a3437870160c ("hugetlb: new sysfs interface") Signed-off-by: Miaohe Lin <linmia...@huawei.com> Reviewed-by: Mike Kravetz <mike.krav...@oracle.com> Reviewed-by: Muchun Song <smuc...@gmail.com> Signed-off-by: Andrew Morton <a...@linux-foundation.org> Signed-off-by: Linus Torvalds <torva...@linux-foundation.org> Signed-off-by: Sasha Levin <sas...@kernel.org> --- mm/hugetlb.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 5a16d892c891c..729706f55dce0 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -2618,8 +2618,10 @@ static int hugetlb_sysfs_add_hstate(struct hstate *h, struct kobject *parent, return -ENOMEM; retval = sysfs_create_group(hstate_kobjs[hi], hstate_attr_group); - if (retval) + if (retval) { kobject_put(hstate_kobjs[hi]); + hstate_kobjs[hi] = NULL; + } return retval; } -- 2.27.0
