[PATCH v2 0/5] media: amphion: fix some issues reported by coverity

[PATCH v2 0/5] media: amphion: fix some issues reported by coverity

[Ming Qian]

Coverity is a proprietary static code analysis tool from Synopsys.
And the coverity scan report some issues about amphion vpu driver,

CHECKED_RETURN: 4 case
REVERSE_INULL: 2 case
UNINIT: 6 case
UNUSED_VALUE: 1 case

Ming Qian (5):
  media: amphion: fix CHECKED_RETURN issues reported by coverity
  media: amphion: fix REVERSE_INULL issues reported by coverity
  media: amphion: fix UNINIT issues reported by coverity
  media: amphion: fix UNUSED_VALUE issue reported by coverity
  media: amphion: ensure the bitops don't cross boundaries

 drivers/media/platform/amphion/vdec.c     |  5 ++++-
 drivers/media/platform/amphion/venc.c     |  6 ++++--
 drivers/media/platform/amphion/vpu_cmds.c |  5 +++--
 drivers/media/platform/amphion/vpu_core.c |  2 ++
 drivers/media/platform/amphion/vpu_dbg.c  | 11 +++++++++--
 drivers/media/platform/amphion/vpu_msgs.c | 12 ++++++------
 6 files changed, 28 insertions(+), 13 deletions(-)

-- 
2.38.1

[PATCH v2 1/5] media: amphion: fix CHECKED_RETURN issues reported by coverity

[Ming Qian]

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@collabora.com>
Signed-off-by: Ming Qian <ming.qian@nxp.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

[PATCH v2 2/5] media: amphion: fix REVERSE_INULL issues reported by coverity

[Ming Qian]

null-checking of a pointor is suggested before dereferencing it

Fixes: 9f599f351e86 ("media: amphion: add vpu core driver")
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Ming Qian <ming.qian@nxp.com>
---
 drivers/media/platform/amphion/venc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/amphion/venc.c b/drivers/media/platform/amphion/venc.c
index 58480e2755ec..4eb57d793a9c 100644
--- a/drivers/media/platform/amphion/venc.c
+++ b/drivers/media/platform/amphion/venc.c
@@ -268,7 +268,7 @@ static int venc_g_parm(struct file *file, void *fh, struct v4l2_streamparm *parm
 {
 	struct vpu_inst *inst = to_inst(file);
 	struct venc_t *venc = inst->priv;
-	struct v4l2_fract *timeperframe = &parm->parm.capture.timeperframe;
+	struct v4l2_fract *timeperframe;
 
 	if (!parm)
 		return -EINVAL;
@@ -279,6 +279,7 @@ static int venc_g_parm(struct file *file, void *fh, struct v4l2_streamparm *parm
 	if (!vpu_helper_check_type(inst, parm->type))
 		return -EINVAL;
 
+	timeperframe = &parm->parm.capture.timeperframe;
 	parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
 	parm->parm.capture.readbuffers = 0;
 	timeperframe->numerator = venc->params.frame_rate.numerator;
@@ -291,7 +292,7 @@ static int venc_s_parm(struct file *file, void *fh, struct v4l2_streamparm *parm
 {
 	struct vpu_inst *inst = to_inst(file);
 	struct venc_t *venc = inst->priv;
-	struct v4l2_fract *timeperframe = &parm->parm.capture.timeperframe;
+	struct v4l2_fract *timeperframe;
 	unsigned long n, d;
 
 	if (!parm)
@@ -303,6 +304,7 @@ static int venc_s_parm(struct file *file, void *fh, struct v4l2_streamparm *parm
 	if (!vpu_helper_check_type(inst, parm->type))
 		return -EINVAL;
 
+	timeperframe = &parm->parm.capture.timeperframe;
 	if (!timeperframe->numerator)
 		timeperframe->numerator = venc->params.frame_rate.numerator;
 	if (!timeperframe->denominator)
-- 
2.38.1

[PATCH v2 3/5] media: amphion: fix UNINIT issues reported by coverity

[Ming Qian]

using uninitialized value may introduce risk

Fixes: 9f599f351e86 ("media: amphion: add vpu core driver")
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Ming Qian <ming.qian@nxp.com>
---
 drivers/media/platform/amphion/vpu_msgs.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/media/platform/amphion/vpu_msgs.c b/drivers/media/platform/amphion/vpu_msgs.c
index f9eb488d1b5e..d0ead051f7d1 100644
--- a/drivers/media/platform/amphion/vpu_msgs.c
+++ b/drivers/media/platform/amphion/vpu_msgs.c
@@ -32,7 +32,7 @@ static void vpu_session_handle_start_done(struct vpu_inst *inst, struct vpu_rpc_
 
 static void vpu_session_handle_mem_request(struct vpu_inst *inst, struct vpu_rpc_event *pkt)
 {
-	struct vpu_pkt_mem_req_data req_data;
+	struct vpu_pkt_mem_req_data req_data = { 0 };
 
 	vpu_iface_unpack_msg_data(inst->core, pkt, (void *)&req_data);
 	vpu_trace(inst->dev, "[%d] %d:%d %d:%d %d:%d\n",
@@ -80,7 +80,7 @@ static void vpu_session_handle_resolution_change(struct vpu_inst *inst, struct v
 
 static void vpu_session_handle_enc_frame_done(struct vpu_inst *inst, struct vpu_rpc_event *pkt)
 {
-	struct vpu_enc_pic_info info;
+	struct vpu_enc_pic_info info = { 0 };
 
 	vpu_iface_unpack_msg_data(inst->core, pkt, (void *)&info);
 	dev_dbg(inst->dev, "[%d] frame id = %d, wptr = 0x%x, size = %d\n",
@@ -90,7 +90,7 @@ static void vpu_session_handle_enc_frame_done(struct vpu_inst *inst, struct vpu_
 
 static void vpu_session_handle_frame_request(struct vpu_inst *inst, struct vpu_rpc_event *pkt)
 {
-	struct vpu_fs_info fs;
+	struct vpu_fs_info fs = { 0 };
 
 	vpu_iface_unpack_msg_data(inst->core, pkt, &fs);
 	call_void_vop(inst, event_notify, VPU_MSG_ID_FRAME_REQ, &fs);
@@ -107,7 +107,7 @@ static void vpu_session_handle_frame_release(struct vpu_inst *inst, struct vpu_r
 		info.type = inst->out_format.type;
 		call_void_vop(inst, buf_done, &info);
 	} else if (inst->core->type == VPU_CORE_TYPE_DEC) {
-		struct vpu_fs_info fs;
+		struct vpu_fs_info fs = { 0 };
 
 		vpu_iface_unpack_msg_data(inst->core, pkt, &fs);
 		call_void_vop(inst, event_notify, VPU_MSG_ID_FRAME_RELEASE, &fs);
@@ -122,7 +122,7 @@ static void vpu_session_handle_input_done(struct vpu_inst *inst, struct vpu_rpc_
 
 static void vpu_session_handle_pic_decoded(struct vpu_inst *inst, struct vpu_rpc_event *pkt)
 {
-	struct vpu_dec_pic_info info;
+	struct vpu_dec_pic_info info = { 0 };
 
 	vpu_iface_unpack_msg_data(inst->core, pkt, (void *)&info);
 	call_void_vop(inst, get_one_frame, &info);
@@ -130,7 +130,7 @@ static void vpu_session_handle_pic_decoded(struct vpu_inst *inst, struct vpu_rpc
 
 static void vpu_session_handle_pic_done(struct vpu_inst *inst, struct vpu_rpc_event *pkt)
 {
-	struct vpu_dec_pic_info info;
+	struct vpu_dec_pic_info info = { 0 };
 	struct vpu_frame_info frame;
 
 	memset(&frame, 0, sizeof(frame));
-- 
2.38.1

[PATCH v2 4/5] media: amphion: fix UNUSED_VALUE issue reported by coverity

[Ming Qian]

assign value '-EINVAL' to ret, but the stored value is overwritten
before it can be used

Fixes: 9f599f351e86 ("media: amphion: add vpu core driver")
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Ming Qian <ming.qian@nxp.com>
---
 drivers/media/platform/amphion/vpu_cmds.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/amphion/vpu_cmds.c b/drivers/media/platform/amphion/vpu_cmds.c
index 7e137f276c3b..235b71398d40 100644
--- a/drivers/media/platform/amphion/vpu_cmds.c
+++ b/drivers/media/platform/amphion/vpu_cmds.c
@@ -315,7 +315,7 @@ static int vpu_session_send_cmd(struct vpu_inst *inst, u32 id, void *data)
 {
 	unsigned long key;
 	int sync = false;
-	int ret = -EINVAL;
+	int ret;
 
 	if (inst->id < 0)
 		return -EINVAL;
-- 
2.38.1

[PATCH v2 5/5] media: amphion: ensure the bitops don't cross boundaries

[Ming Qian]

the supported_instance_count determine the instance index range,
it shouldn't exceed the bits number of instance_mask,
otherwise the bitops of instance_mask may cross boundaries

Fixes: 9f599f351e86 ("media: amphion: add vpu core driver")
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Ming Qian <ming.qian@nxp.com>
---
 drivers/media/platform/amphion/vpu_core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/media/platform/amphion/vpu_core.c b/drivers/media/platform/amphion/vpu_core.c
index 43d85a54268b..6f054700d5db 100644
--- a/drivers/media/platform/amphion/vpu_core.c
+++ b/drivers/media/platform/amphion/vpu_core.c
@@ -88,6 +88,8 @@ static int vpu_core_boot_done(struct vpu_core *core)
 
 		core->supported_instance_count = min(core->supported_instance_count, count);
 	}
+	if (core->supported_instance_count >= BITS_PER_TYPE(core->instance_mask))
+		core->supported_instance_count = BITS_PER_TYPE(core->instance_mask);
 	core->fw_version = fw_version;
 	vpu_core_set_state(core, VPU_CORE_ACTIVE);
 
-- 
2.38.1