[PATCH net v2 2/2] net: fman: add error cleanup path in fman_probe

[ZhaoJinming]

fman_init() and devm_request_irq() failure paths in fman_probe()
do not free fman and its sub-resources (keygen, muram allocations,
state, cfg), causing memory leaks on probe failure.

Add fman_muram_finish() to properly tear down a MURAM partition
(gen_pool_destroy + iounmap + kfree), complementing the existing
fman_muram_init().

Add fman_free_resources() that releases all fman sub-resources
in the correct order:
- devm_free_irq() for any already-registered IRQ handlers
- kfree(fman->keygen)
- free_init_resources() for MURAM CAM/FIFO allocations
- kfree(fman->cfg)
- fman_muram_finish(fman->muram) for the MURAM management object
- kfree(fman->state)
- kfree(fman)

Use two goto labels in fman_probe():
- err_irq: main IRQ registered but err_irq failed -- free main IRQ
  then fall through to release resources
- err_no_irq: no IRQ registered -- just release resources

The IRQ handlers must be explicitly freed before kfree(fman) to
avoid a window where a shared-IRQ spurious firing could dereference
the freed dev_id.

Note: fman_config() is not changed -- it already frees fman
internally on all its error paths, so fman_probe() must not touch
fman after fman_config() fails.

v2:
- add explicit devm_free_irq() before kfree(fman) to eliminate
  a potential UAF window on the cleanup path
- add fman_muram_finish() for complete MURAM teardown
- add kfree(fman->cfg) to release config structure

Fixes: 414fd46e7762 ("fsl/fman: Add FMan support")
Signed-off-by: ZhaoJinming <zhaojinming@xxxxxxxxxxxxx>
---
 drivers/net/ethernet/freescale/fman/fman.c    | 31 +++++++++++++++++--
 .../net/ethernet/freescale/fman/fman_muram.c  | 15 +++++++++
 .../net/ethernet/freescale/fman/fman_muram.h  |  2 ++
 3 files changed, 45 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fman/fman.c b/drivers/net/ethernet/freescale/fman/fman.c
index 6947f3bc7c87..752c0df0e17c 100644
--- a/drivers/net/ethernet/freescale/fman/fman.c
+++ b/drivers/net/ethernet/freescale/fman/fman.c
@@ -2806,6 +2806,24 @@ static struct fman *read_dts_node(struct platform_device *of_dev)
 	return ERR_PTR(err);
 }
 
+static void fman_free_resources(struct fman *fman, struct device *dev,
+				bool irq_registered)
+{
+	/* Free IRQs first while fman is still valid */
+	if (irq_registered) {
+		if (fman->dts_params.err_irq != 0)
+			devm_free_irq(dev, fman->dts_params.err_irq, fman);
+		devm_free_irq(dev, fman->dts_params.irq, fman);
+	}
+
+	kfree(fman->keygen);
+	free_init_resources(fman);
+	kfree(fman->cfg);
+	fman_muram_finish(fman->muram);
+	kfree(fman->state);
+	kfree(fman);
+}
+
 static int fman_probe(struct platform_device *of_dev)
 {
 	struct fman *fman;
@@ -2821,12 +2839,13 @@ static int fman_probe(struct platform_device *of_dev)
 	err = fman_config(fman);
 	if (err) {
 		dev_err(dev, "%s: FMan config failed\n", __func__);
+		/* fman_config() frees fman internally on all error paths */
 		return -EINVAL;
 	}
 
 	if (fman_init(fman) != 0) {
 		dev_err(dev, "%s: FMan init failed\n", __func__);
-		return -EINVAL;
+		goto err_no_irq;
 	}
 
 	/* Register IRQ handlers only after initialization is complete.
@@ -2844,7 +2863,7 @@ static int fman_probe(struct platform_device *of_dev)
 	if (err < 0) {
 		dev_err(dev, "%s: irq %d allocation failed (error = %d)\n",
 			__func__, fman->dts_params.irq, err);
-		return err;
+		goto err_no_irq;
 	}
 
 	if (fman->dts_params.err_irq != 0) {
@@ -2854,7 +2873,7 @@ static int fman_probe(struct platform_device *of_dev)
 		if (err < 0) {
 			dev_err(dev, "%s: irq %d allocation failed (error = %d)\n",
 				__func__, fman->dts_params.err_irq, err);
-			return err;
+			goto err_irq;
 		}
 	}
 
@@ -2883,6 +2902,12 @@ static int fman_probe(struct platform_device *of_dev)
 	dev_dbg(dev, "FMan%d probed\n", fman->dts_params.id);
 
 	return 0;
+
+err_irq:
+	devm_free_irq(dev, fman->dts_params.irq, fman);
+err_no_irq:
+	fman_free_resources(fman, dev, false);
+	return err ?: -EINVAL;
 }
 
 static const struct of_device_id fman_match[] = {
diff --git a/drivers/net/ethernet/freescale/fman/fman_muram.c b/drivers/net/ethernet/freescale/fman/fman_muram.c
index 6ac7c2b0cb19..6c2b4f7a02b8 100644
--- a/drivers/net/ethernet/freescale/fman/fman_muram.c
+++ b/drivers/net/ethernet/freescale/fman/fman_muram.c
@@ -129,3 +129,18 @@ void fman_muram_free_mem(struct muram_info *muram, unsigned long offset,
 
 	gen_pool_free(muram->pool, addr, size);
 }
+
+/**
+ * fman_muram_finish
+ * @muram:	FM-MURAM module pointer.
+ *
+ * Frees all resources associated with a MURAM partition.
+ */
+void fman_muram_finish(struct muram_info *muram)
+{
+	if (!muram)
+		return;
+	iounmap(muram->vbase);
+	gen_pool_destroy(muram->pool);
+	kfree(muram);
+}
diff --git a/drivers/net/ethernet/freescale/fman/fman_muram.h b/drivers/net/ethernet/freescale/fman/fman_muram.h
index 3643af61bae2..a5cb544c0f08 100644
--- a/drivers/net/ethernet/freescale/fman/fman_muram.h
+++ b/drivers/net/ethernet/freescale/fman/fman_muram.h
@@ -23,4 +23,6 @@ unsigned long fman_muram_alloc(struct muram_info *muram, size_t size);
 void fman_muram_free_mem(struct muram_info *muram, unsigned long offset,
 			 size_t size);
 
+void fman_muram_finish(struct muram_info *muram);
+
 #endif /* __FM_MURAM_EXT */
-- 
2.20.1