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authorDan Carpenter <dan.carpenter@oracle.com>2020-05-08 18:07:40 +0300
committerTejun Heo <tj@kernel.org>2020-05-11 17:25:42 +0300
commitb92b36eadf4d7fa4a34f048c2a3bb61a735a885e (patch)
tree509e65da7d8a1484708b97e6d2098758864c02e3 /kernel/workqueue.c
parentf187b6974f6dfbeba4aafda972cc37f27d091b73 (diff)
downloadlinux-b92b36eadf4d7fa4a34f048c2a3bb61a735a885e.tar.xz
workqueue: Fix an use after free in init_rescuer()
We need to preserve error code before freeing "rescuer". Fixes: f187b6974f6df ("workqueue: Use IS_ERR and PTR_ERR instead of PTR_ERR_OR_ZERO.") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Lai Jiangshan <jiangshanlai@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/workqueue.c')
-rw-r--r--kernel/workqueue.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index ddf0537dce14..10ed8d761e0b 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4197,6 +4197,7 @@ static int wq_clamp_max_active(int max_active, unsigned int flags,
static int init_rescuer(struct workqueue_struct *wq)
{
struct worker *rescuer;
+ int ret;
if (!(wq->flags & WQ_MEM_RECLAIM))
return 0;
@@ -4208,8 +4209,9 @@ static int init_rescuer(struct workqueue_struct *wq)
rescuer->rescue_wq = wq;
rescuer->task = kthread_create(rescuer_thread, rescuer, "%s", wq->name);
if (IS_ERR(rescuer->task)) {
+ ret = PTR_ERR(rescuer->task);
kfree(rescuer);
- return PTR_ERR(rescuer->task);
+ return ret;
}
wq->rescuer = rescuer;