linux-kernel - [PATCH] media: v4l2-mem2mem: fix mem order in last buf

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Date: Sun, 11 Feb 2024 02:04:06 +0800
From: Hsia-Jun Li <randy.li@...aptics.com>
To: linux-media@...r.kernel.org
Cc: mchehab@...nel.org,
	hverkuil-cisco@...all.nl,
	sebastian.fricke@...labora.com,
	nicolas.dufresne@...labora.com,
	alexious@....edu.cn,
	ayaka@...lik.info,
	linux-kernel@...r.kernel.org,
	"Hsia-Jun(Randy) Li" <randy.li@...aptics.com>
Subject: [PATCH] media: v4l2-mem2mem: fix mem order in last buf

From: "Hsia-Jun(Randy) Li" <randy.li@...aptics.com>

The has_stopped property in struct v4l2_m2m_ctx is operated
without a lock protecction. Then the userspace calls to
v4l2_m2m_encoder_cmd()/v4l2_m2m_decoder_cmd() may lead to
a critical section issue.

Signed-off-by: Hsia-Jun(Randy) Li <randy.li@...aptics.com>
---
 drivers/media/v4l2-core/v4l2-mem2mem.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
index 75517134a5e9..f1de71031e02 100644
--- a/drivers/media/v4l2-core/v4l2-mem2mem.c
+++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
@@ -635,9 +635,9 @@ void v4l2_m2m_last_buffer_done(struct v4l2_m2m_ctx *m2m_ctx,
 			       struct vb2_v4l2_buffer *vbuf)
 {
 	vbuf->flags |= V4L2_BUF_FLAG_LAST;
-	vb2_buffer_done(&vbuf->vb2_buf, VB2_BUF_STATE_DONE);
-
 	v4l2_m2m_mark_stopped(m2m_ctx);
+
+	vb2_buffer_done(&vbuf->vb2_buf, VB2_BUF_STATE_DONE);
 }
 EXPORT_SYMBOL_GPL(v4l2_m2m_last_buffer_done);
 
-- 
2.17.1