linux-kernel - [PATCH 5.17 111/114] dma-buf: call dma_buf_stats

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Date:   Mon, 16 May 2022 21:37:25 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Charan Teja Reddy <quic_charante@...cinc.com>,
        "T.J. Mercier" <tjmercier@...gle.com>,
        Christian König <christian.koenig@....com>
Subject: [PATCH 5.17 111/114] dma-buf: call dma_buf_stats_setup after dmabuf is in valid list

From: Charan Teja Reddy <quic_charante@...cinc.com>

commit ef3a6b70507a2add2cd2e01f5eb9b54d561bacb9 upstream.

When dma_buf_stats_setup() fails, it closes the dmabuf file which
results into the calling of dma_buf_file_release() where it does
list_del(&dmabuf->list_node) with out first adding it to the proper
list. This is resulting into panic in the below path:
__list_del_entry_valid+0x38/0xac
dma_buf_file_release+0x74/0x158
__fput+0xf4/0x428
____fput+0x14/0x24
task_work_run+0x178/0x24c
do_notify_resume+0x194/0x264
work_pending+0xc/0x5f0

Fix it by moving the dma_buf_stats_setup() after dmabuf is added to the
list.

Fixes: bdb8d06dfefd ("dmabuf: Add the capability to expose DMA-BUF stats in sysfs")
Signed-off-by: Charan Teja Reddy <quic_charante@...cinc.com>
Tested-by: T.J. Mercier <tjmercier@...gle.com>
Acked-by: T.J. Mercier <tjmercier@...gle.com>
Cc: <stable@...r.kernel.org> # 5.15.x+
Reviewed-by: Christian König <christian.koenig@....com>
Signed-off-by: Christian König <christian.koenig@....com>
Link: https://patchwork.freedesktop.org/patch/msgid/1652125797-2043-1-git-send-email-quic_charante@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/dma-buf/dma-buf.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -543,10 +543,6 @@ struct dma_buf *dma_buf_export(const str
 	file->f_mode |= FMODE_LSEEK;
 	dmabuf->file = file;
 
-	ret = dma_buf_stats_setup(dmabuf);
-	if (ret)
-		goto err_sysfs;
-
 	mutex_init(&dmabuf->lock);
 	INIT_LIST_HEAD(&dmabuf->attachments);
 
@@ -554,6 +550,10 @@ struct dma_buf *dma_buf_export(const str
 	list_add(&dmabuf->list_node, &db_list.head);
 	mutex_unlock(&db_list.lock);
 
+	ret = dma_buf_stats_setup(dmabuf);
+	if (ret)
+		goto err_sysfs;
+
 	return dmabuf;
 
 err_sysfs: