UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

[media] media-entity: fix backlink removal on __media_entity_remove_link() 

The logic is testing if num_links==0 at the wrong place. Due to
that, a backlink may be kept without removal, causing KASAN
to complain about usage after free during either entity or
link removal.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Mauro Carvalho Chehab 2015-12-10 15:29:22 -02:00
parent a9709e4354
commit eb83a51768
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/media/media-entity.c
View File

@ -662,13 +662,13 @@ static void __media_entity_remove_link(struct media_entity *entity,
if (link->source->entity == entity)
remote->num_backlinks--;
if (--remote->num_links == 0)
break;
/* Remove the remote link */
list_del(&rlink->list);
media_gobj_remove(&rlink->graph_obj);
kfree(rlink);
if (--remote->num_links == 0)
break;
}
list_del(&link->list);
media_gobj_remove(&link->graph_obj);