From: Tang Yizhou tangyizhou@huawei.com
ascend inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I4EUVI CVE: NA
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sp_group_add_task() may be called with a valid spg_id as input parameter. It should not be freed in abnormal branch.
Reported-by: Wang Wensheng wangwensheng4@huawei.com Signed-off-by: Tang Yizhou tangyizhou@huawei.com Reviewed-by: Kefeng Wang wangkefeng.wang@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com Reviewed-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- mm/share_pool.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/mm/share_pool.c b/mm/share_pool.c index 12468f785686d..6cbbf2138ad6e 100644 --- a/mm/share_pool.c +++ b/mm/share_pool.c @@ -500,6 +500,7 @@ int sp_group_add_task(int pid, int spg_id) struct mm_struct *mm; struct sp_group *spg; int ret = 0; + bool id_newly_generated = false; struct sp_area *spa, *prev = NULL; struct sp_proc_stat *stat;
@@ -538,6 +539,7 @@ int sp_group_add_task(int pid, int spg_id) "generate group id failed\n"); return spg_id; } + id_newly_generated = true; }
if (spg_id == SPG_ID_DVPP_PASS_THROUGH) { @@ -550,6 +552,7 @@ int sp_group_add_task(int pid, int spg_id) "generate group id failed in DVPP pass through\n"); return spg_id; } + id_newly_generated = true; }
mutex_lock(&sp_mutex); @@ -564,7 +567,8 @@ int sp_group_add_task(int pid, int spg_id)
rcu_read_unlock(); if (ret) { - free_sp_group_id((unsigned int)spg_id); + if (id_newly_generated) + free_sp_group_id((unsigned int)spg_id); goto out_unlock; }
@@ -581,7 +585,8 @@ int sp_group_add_task(int pid, int spg_id) spg = find_or_alloc_sp_group(spg_id); if (IS_ERR(spg)) { ret = PTR_ERR(spg); - free_sp_group_id((unsigned int)spg_id); + if (id_newly_generated) + free_sp_group_id((unsigned int)spg_id); goto out_put_mm; }