linux-kernel - [PATCH v2,1/5] media: mediatek: vcodec: Fix getting NULL pointer for dst buffer

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Message-ID: <20221117092453.31366-2-yunfei.dong@mediatek.com>
Date:   Thu, 17 Nov 2022 17:24:49 +0800
From:   Yunfei Dong <yunfei.dong@...iatek.com>
To:     Yunfei Dong <yunfei.dong@...iatek.com>,
        Chen-Yu Tsai <wenst@...omium.org>,
        Nicolas Dufresne <nicolas@...fresne.ca>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        Tiffany Lin <tiffany.lin@...iatek.com>
CC:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        George Sun <george.sun@...iatek.com>,
        Xiaoyong Lu <xiaoyong.lu@...iatek.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Fritz Koenig <frkoenig@...omium.org>,
        Daniel Vetter <daniel@...ll.ch>,
        Steve Cho <stevecho@...omium.org>,
        <linux-media@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: [PATCH v2,1/5] media: mediatek: vcodec: Fix getting NULL pointer for dst buffer

The driver may can't get v4l2 buffer when lat or core decode timeout,
will lead to crash when call v4l2_m2m_buf_done to set dst buffer
(NULL pointer) done.

Fixes: 7b182b8d9c85 ("media: mediatek: vcodec: Refactor get and put capture buffer flow")
Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.com>
---
 .../mediatek/vcodec/mtk_vcodec_dec_stateless.c        | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c
index c45bd2599bb2..e86809052a9f 100644
--- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c
+++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c
@@ -138,10 +138,13 @@ static void mtk_vdec_stateless_cap_to_disp(struct mtk_vcodec_ctx *ctx, int error
 		state = VB2_BUF_STATE_DONE;
 
 	vb2_dst = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx);
-	v4l2_m2m_buf_done(vb2_dst, state);
-
-	mtk_v4l2_debug(2, "free frame buffer id:%d to done list",
-		       vb2_dst->vb2_buf.index);
+	if (vb2_dst) {
+		v4l2_m2m_buf_done(vb2_dst, state);
+		mtk_v4l2_debug(2, "free frame buffer id:%d to done list",
+			       vb2_dst->vb2_buf.index);
+	} else {
+		mtk_v4l2_err("dst buffer is NULL");
+	}
 
 	if (src_buf_req)
 		v4l2_ctrl_request_complete(src_buf_req, &ctx->ctrl_hdl);
-- 
2.18.0