[PATCH v2] media: nxp: imx8-isi: fix memory leaks in probe error paths and remove

[David Carlier <devnexen@gmail.com>]

mxc_isi_probe() allocates isi->pipes with kzalloc_objs() but never
frees it on any probe failure path or in mxc_isi_remove(), leaking the
allocation on every failed probe and every normal unbind.

Additionally, when mxc_isi_pipe_init() fails partway through the
channel loop or when mxc_isi_v4l2_init() fails, the already initialized
pipes are not cleaned up — their media entities and mutexes are leaked.

Fix both by adding kfree(isi->pipes) to all probe error paths and to
mxc_isi_remove(), and cleaning up already-initialized pipes in the
err_xbar error path.

Fixes: cf21f328fcaf ("media: nxp: Add i.MX8 ISI driver")
Signed-off-by: David Carlier <devnexen@gmail.com>
---
 .../platform/nxp/imx8-isi/imx8-isi-core.c     | 24 +++++++++++++++----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c b/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c
index 4bf8570e1b9e..ab32c5b6ac9c 100644
--- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c
+++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c
@@ -490,33 +490,43 @@ static int mxc_isi_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	isi->num_clks = devm_clk_bulk_get_all(dev, &isi->clks);
-	if (isi->num_clks < 0)
+	if (isi->num_clks < 0) {
+		kfree(isi->pipes);
 		return dev_err_probe(dev, isi->num_clks, "Failed to get clocks\n");
+	}
 
 	isi->regs = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(isi->regs))
+	if (IS_ERR(isi->regs)) {
+		kfree(isi->pipes);
 		return dev_err_probe(dev, PTR_ERR(isi->regs),
 				     "Failed to get ISI register map\n");
+	}
 
 	if (isi->pdata->gasket_ops) {
 		isi->gasket = syscon_regmap_lookup_by_phandle(dev->of_node,
 							      "fsl,blk-ctrl");
-		if (IS_ERR(isi->gasket))
+		if (IS_ERR(isi->gasket)) {
+			kfree(isi->pipes);
 			return dev_err_probe(dev, PTR_ERR(isi->gasket),
 					     "failed to get gasket\n");
+		}
 	}
 
 	dma_size = isi->pdata->has_36bit_dma ? 36 : 32;
 	dma_set_mask_and_coherent(dev, DMA_BIT_MASK(dma_size));
 
 	ret = devm_pm_runtime_enable(dev);
-	if (ret)
+	if (ret) {
+		kfree(isi->pipes);
 		return ret;
+	}
 
 	ret = mxc_isi_crossbar_init(isi);
-	if (ret)
+	if (ret) {
+		kfree(isi->pipes);
 		return dev_err_probe(dev, ret,
 				     "Failed to initialize crossbar\n");
+	}
 
 	for (i = 0; i < isi->pdata->num_channels; ++i) {
 		ret = mxc_isi_pipe_init(isi, i);
@@ -538,7 +548,10 @@ static int mxc_isi_probe(struct platform_device *pdev)
 	return 0;
 
 err_xbar:
+	while (i--)
+		mxc_isi_pipe_cleanup(&isi->pipes[i]);
 	mxc_isi_crossbar_cleanup(&isi->crossbar);
+	kfree(isi->pipes);
 
 	return ret;
 }
@@ -556,6 +569,7 @@ static void mxc_isi_remove(struct platform_device *pdev)
 		mxc_isi_pipe_cleanup(pipe);
 	}
 
+	kfree(isi->pipes);
 	mxc_isi_crossbar_cleanup(&isi->crossbar);
 	mxc_isi_v4l2_cleanup(isi);
 }
-- 
2.53.0