Re: [PATCH v3,1/2] media: mediatek: vcodec: adding lock to protect decoder context list

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Hey Yunfei,

On 22.02.2024 17:26, Yunfei Dong wrote:
The ctx_list will be deleted when scp getting unexpected behavior, then the
ctx_list->next will be NULL, the kernel driver maybe access NULL pointer in
function vpu_dec_ipi_handler when going through each context, then reboot.


Need to add lock to protect the ctx_list to make sure the ctx_list->next isn't
NULL pointer.

Same here as with the encoder changes.

Greetings,
Sebastian


Hardware name: Google juniper sku16 board (DT)
pstate: 20400005 (nzCv daif +PAN -UAO -TCO BTYPE=--)
pc : vpu_dec_ipi_handler+0x58/0x1f8 [mtk_vcodec_dec]
lr : scp_ipi_handler+0xd0/0x194 [mtk_scp]
sp : ffffffc0131dbbd0
x29: ffffffc0131dbbd0 x28: 0000000000000000
x27: ffffff9bb277f348 x26: ffffff9bb242ad00
x25: ffffffd2d440d3b8 x24: ffffffd2a13ff1d4
x23: ffffff9bb7fe85a0 x22: ffffffc0133fbdb0
x21: 0000000000000010 x20: ffffff9b050ea328
x19: ffffffc0131dbc08 x18: 0000000000001000
x17: 0000000000000000 x16: ffffffd2d461c6e0
x15: 0000000000000242 x14: 000000000000018f
x13: 000000000000004d x12: 0000000000000000
x11: 0000000000000001 x10: fffffffffffffff0
x9 : ffffff9bb6e793a8 x8 : 0000000000000000
x7 : 0000000000000000 x6 : 000000000000003f
x5 : 0000000000000040 x4 : fffffffffffffff0
x3 : 0000000000000020 x2 : ffffff9bb6e79080
x1 : 0000000000000010 x0 : ffffffc0131dbc08
Call trace:
vpu_dec_ipi_handler+0x58/0x1f8 [mtk_vcodec_dec (HASH:6c3f 2)]
scp_ipi_handler+0xd0/0x194 [mtk_scp (HASH:7046 3)]
mt8183_scp_irq_handler+0x44/0x88 [mtk_scp (HASH:7046 3)]
scp_irq_handler+0x48/0x90 [mtk_scp (HASH:7046 3)]
irq_thread_fn+0x38/0x94
irq_thread+0x100/0x1c0
kthread+0x140/0x1fc
ret_from_fork+0x10/0x30
Code: 54000088 f94ca50a eb14015f 54000060 (f9400108)
---[ end trace ace43ce36cbd5c93 ]---
Kernel panic - not syncing: Oops: Fatal exception
SMP: stopping secondary CPUs
Kernel Offset: 0x12c4000000 from 0xffffffc010000000
PHYS_OFFSET: 0xffffffe580000000
CPU features: 0x08240002,2188200c
Memory Limit: none

Fixes: 655b86e52eac ("media: mediatek: vcodec: Fix possible invalid memory access for decoder")
Signed-off-by: Yunfei Dong <yunfei.dong@xxxxxxxxxxxx>
---
.../platform/mediatek/vcodec/common/mtk_vcodec_fw_vpu.c      | 4 ++--
.../platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.c    | 5 +++++
.../platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.h    | 2 ++
drivers/media/platform/mediatek/vcodec/decoder/vdec_vpu_if.c | 2 ++
4 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_fw_vpu.c b/drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_fw_vpu.c
index 9f6e4b59455da..9a11a2c248045 100644
--- a/drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_fw_vpu.c
+++ b/drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_fw_vpu.c
@@ -58,12 +58,12 @@ static void mtk_vcodec_vpu_reset_dec_handler(void *priv)

	dev_err(&dev->plat_dev->dev, "Watchdog timeout!!");

-	mutex_lock(&dev->dev_mutex);
+	mutex_lock(&dev->dev_ctx_lock);
	list_for_each_entry(ctx, &dev->ctx_list, list) {
		ctx->state = MTK_STATE_ABORT;
		mtk_v4l2_vdec_dbg(0, ctx, "[%d] Change to state MTK_STATE_ABORT", ctx->id);
	}
-	mutex_unlock(&dev->dev_mutex);
+	mutex_unlock(&dev->dev_ctx_lock);
}

static void mtk_vcodec_vpu_reset_enc_handler(void *priv)
diff --git a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.c b/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.c
index ad9b68380692f..d69c9fe2af6f3 100644
--- a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.c
+++ b/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.c
@@ -267,7 +267,9 @@ static int fops_vcodec_open(struct file *file)

	ctx->dev->vdec_pdata->init_vdec_params(ctx);

+	mutex_lock(&dev->dev_ctx_lock);
	list_add(&ctx->list, &dev->ctx_list);
+	mutex_unlock(&dev->dev_ctx_lock);
	mtk_vcodec_dbgfs_create(ctx);

	mutex_unlock(&dev->dev_mutex);
@@ -310,7 +312,9 @@ static int fops_vcodec_release(struct file *file)
	v4l2_ctrl_handler_free(&ctx->ctrl_hdl);

	mtk_vcodec_dbgfs_remove(dev, ctx->id);
+	mutex_lock(&dev->dev_ctx_lock);
	list_del_init(&ctx->list);
+	mutex_unlock(&dev->dev_ctx_lock);
	kfree(ctx);
	mutex_unlock(&dev->dev_mutex);
	return 0;
@@ -403,6 +407,7 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
	for (i = 0; i < MTK_VDEC_HW_MAX; i++)
		mutex_init(&dev->dec_mutex[i]);
	mutex_init(&dev->dev_mutex);
+	mutex_init(&dev->dev_ctx_lock);
	spin_lock_init(&dev->irqlock);

	snprintf(dev->v4l2_dev.name, sizeof(dev->v4l2_dev.name), "%s",
diff --git a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.h b/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.h
index 849b89dd205c2..85b2c0d3d8bcd 100644
--- a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.h
+++ b/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.h
@@ -241,6 +241,7 @@ struct mtk_vcodec_dec_ctx {
 *
 * @dec_mutex: decoder hardware lock
 * @dev_mutex: video_device lock
+ * @dev_ctx_lock: the lock of context list
 * @decode_workqueue: decode work queue
 *
 * @irqlock: protect data access by irq handler and work thread
@@ -282,6 +283,7 @@ struct mtk_vcodec_dec_dev {
	/* decoder hardware mutex lock */
	struct mutex dec_mutex[MTK_VDEC_HW_MAX];
	struct mutex dev_mutex;
+	struct mutex dev_ctx_lock;
	struct workqueue_struct *decode_workqueue;

	spinlock_t irqlock;
diff --git a/drivers/media/platform/mediatek/vcodec/decoder/vdec_vpu_if.c b/drivers/media/platform/mediatek/vcodec/decoder/vdec_vpu_if.c
index 82e57ae983d55..da6be556727bb 100644
--- a/drivers/media/platform/mediatek/vcodec/decoder/vdec_vpu_if.c
+++ b/drivers/media/platform/mediatek/vcodec/decoder/vdec_vpu_if.c
@@ -77,12 +77,14 @@ static bool vpu_dec_check_ap_inst(struct mtk_vcodec_dec_dev *dec_dev, struct vde
	struct mtk_vcodec_dec_ctx *ctx;
	int ret = false;

+	mutex_lock(&dec_dev->dev_ctx_lock);
	list_for_each_entry(ctx, &dec_dev->ctx_list, list) {
		if (!IS_ERR_OR_NULL(ctx) && ctx->vpu_inst == vpu) {
			ret = true;
			break;
		}
	}
+	mutex_unlock(&dec_dev->dev_ctx_lock);

	return ret;
}
--
2.18.0






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