linux-kernel - [PATCH v2 1/5] media: amphion: fix CHECKED

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Date:   Tue, 18 Jul 2023 17:50:09 +0800
From:   Ming Qian <ming.qian@....com>
To:     mchehab@...nel.org, hverkuil-cisco@...all.nl
Cc:     shawnguo@...nel.org, robh+dt@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        xiahong.bao@....com, eagle.zhou@....com, tao.jiang_2@....com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2 1/5] media: amphion: fix CHECKED_RETURN issues reported by coverity

calling "vpu_cmd_send/vpu_get_buffer_state/vpu_session_alloc_fs"
without checking return value

Fixes: 9f599f351e86 ("media: amphion: add vpu core driver")
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
Signed-off-by: Ming Qian <ming.qian@....com>
---
 drivers/media/platform/amphion/vdec.c     |  5 ++++-
 drivers/media/platform/amphion/vpu_cmds.c |  3 ++-
 drivers/media/platform/amphion/vpu_dbg.c  | 11 +++++++++--
 3 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/amphion/vdec.c b/drivers/media/platform/amphion/vdec.c
index eeb2ef72df5b..133d77d1ea0c 100644
--- a/drivers/media/platform/amphion/vdec.c
+++ b/drivers/media/platform/amphion/vdec.c
@@ -1019,6 +1019,7 @@ static int vdec_response_frame_abnormal(struct vpu_inst *inst)
 {
 	struct vdec_t *vdec = inst->priv;
 	struct vpu_fs_info info;
+	int ret;
 
 	if (!vdec->req_frame_count)
 		return 0;
@@ -1026,7 +1027,9 @@ static int vdec_response_frame_abnormal(struct vpu_inst *inst)
 	memset(&info, 0, sizeof(info));
 	info.type = MEM_RES_FRAME;
 	info.tag = vdec->seq_tag + 0xf0;
-	vpu_session_alloc_fs(inst, &info);
+	ret = vpu_session_alloc_fs(inst, &info);
+	if (ret)
+		return ret;
 	vdec->req_frame_count--;
 
 	return 0;
diff --git a/drivers/media/platform/amphion/vpu_cmds.c b/drivers/media/platform/amphion/vpu_cmds.c
index 647d94554fb5..7e137f276c3b 100644
--- a/drivers/media/platform/amphion/vpu_cmds.c
+++ b/drivers/media/platform/amphion/vpu_cmds.c
@@ -306,7 +306,8 @@ static void vpu_core_keep_active(struct vpu_core *core)
 
 	dev_dbg(core->dev, "try to wake up\n");
 	mutex_lock(&core->cmd_lock);
-	vpu_cmd_send(core, &pkt);
+	if (vpu_cmd_send(core, &pkt))
+		dev_err(core->dev, "fail to keep active\n");
 	mutex_unlock(&core->cmd_lock);
 }
 
diff --git a/drivers/media/platform/amphion/vpu_dbg.c b/drivers/media/platform/amphion/vpu_dbg.c
index adc523b95061..982c2c777484 100644
--- a/drivers/media/platform/amphion/vpu_dbg.c
+++ b/drivers/media/platform/amphion/vpu_dbg.c
@@ -50,6 +50,13 @@ static char *vpu_stat_name[] = {
 	[VPU_BUF_STATE_ERROR] = "error",
 };
 
+static inline const char *to_vpu_stat_name(int state)
+{
+	if (state <= VPU_BUF_STATE_ERROR)
+		return vpu_stat_name[state];
+	return "unknown";
+}
+
 static int vpu_dbg_instance(struct seq_file *s, void *data)
 {
 	struct vpu_inst *inst = s->private;
@@ -141,7 +148,7 @@ static int vpu_dbg_instance(struct seq_file *s, void *data)
 		num = scnprintf(str, sizeof(str),
 				"output [%2d] state = %10s, %8s\n",
 				i, vb2_stat_name[vb->state],
-				vpu_stat_name[vpu_get_buffer_state(vbuf)]);
+				to_vpu_stat_name(vpu_get_buffer_state(vbuf)));
 		if (seq_write(s, str, num))
 			return 0;
 	}
@@ -156,7 +163,7 @@ static int vpu_dbg_instance(struct seq_file *s, void *data)
 		num = scnprintf(str, sizeof(str),
 				"capture[%2d] state = %10s, %8s\n",
 				i, vb2_stat_name[vb->state],
-				vpu_stat_name[vpu_get_buffer_state(vbuf)]);
+				to_vpu_stat_name(vpu_get_buffer_state(vbuf)));
 		if (seq_write(s, str, num))
 			return 0;
 	}
-- 
2.38.1