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dma-buf: handle testing kthreads creation failure

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commit 6cb05d89fd upstream.

kthread creation may possibly fail inside race_signal_callback(). In
such a case stop the already started threads, put the already taken
references to them and return with error code.

Found by Linux Verification Center (linuxtesting.org).

Fixes: 2989f64510 ("dma-buf: Add selftests for dma-fence")
Cc: stable@vger.kernel.org
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
Reviewed-by: T.J. Mercier <tjmercier@google.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240522181308.841686-1-pchelkin@ispras.ru
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Fedor Pchelkin
2024-05-22 21:13:08 +03:00
committed by Greg Kroah-Hartman
parent 3627605de4
commit 0c1f6e1418
1 changed files with 6 additions and 0 deletions
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6
drivers/dma-buf/st-dma-fence.c
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@@ -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_put(t[i].task);
return ret;
}
get_task_struct(t[i].task);
}