linux-kernel - [PATCH] dma-buf: handle testing kthreads creation failure

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Date: Wed, 22 May 2024 15:23:26 +0300
From: Fedor Pchelkin <pchelkin@...ras.ru>
To: Christian König <christian.koenig@....com>,
	Sumit Semwal <sumit.semwal@...aro.org>
Cc: Fedor Pchelkin <pchelkin@...ras.ru>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	linux-media@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linaro-mm-sig@...ts.linaro.org,
	linux-kernel@...r.kernel.org,
	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	lvc-project@...uxtesting.org,
	stable@...r.kernel.org
Subject: [PATCH] dma-buf: handle testing kthreads creation failure

kthread creation may possibly fail inside race_signal_callback(). In
such case stop the already started threads and return with error code.

Found by Linux Verification Center (linuxtesting.org).

Fixes: 2989f6451084 ("dma-buf: Add selftests for dma-fence")
Cc: stable@...r.kernel.org
Signed-off-by: Fedor Pchelkin <pchelkin@...ras.ru>
---
 drivers/dma-buf/st-dma-fence.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/dma-buf/st-dma-fence.c b/drivers/dma-buf/st-dma-fence.c
index b7c6f7ea9e0c..ab1ec4631578 100644
--- a/drivers/dma-buf/st-dma-fence.c
+++ b/drivers/dma-buf/st-dma-fence.c
@@ -540,6 +540,12 @@ static int race_signal_callback(void *arg)
 			t[i].before = pass;
 			t[i].task = kthread_run(thread_signal_callback, &t[i],
 						"dma-fence:%d", i);
+			if (IS_ERR(t[i].task)) {
+				ret = PTR_ERR(t[i].task);
+				while (--i >= 0)
+					kthread_stop(t[i].task);
+				return ret;
+			}
 			get_task_struct(t[i].task);
 		}
 
-- 
2.39.2