[PATCH net v3] net: xilinx: axienet: Add error handling for RX metadata pointer retrieval

[Abin Joseph <abin.joseph@amd.com>]

Add proper error checking for dmaengine_desc_get_metadata_ptr() which
can return an error pointer and lead to potential crashes or undefined
behaviour if the pointer retrieval fails.

Properly handle the error by unmapping DMA buffer, freeing the skb and
returning early to prevent further processing with invalid data.

Fixes: 6a91b846af85 ("net: axienet: Introduce dmaengine support")
Signed-off-by: Abin Joseph <abin.joseph@amd.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com> 
---

Changes in v2:
Fix the alias to net

Changes in v3:
Remove unwanted space 
Add reviewed by tag

---
 drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index 0d8a05fe541a..ec6d47dc984a 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -1168,6 +1168,15 @@ static void axienet_dma_rx_cb(void *data, const struct dmaengine_result *result)
 						       &meta_max_len);
 	dma_unmap_single(lp->dev, skbuf_dma->dma_address, lp->max_frm_size,
 			 DMA_FROM_DEVICE);
+
+	if (IS_ERR(app_metadata)) {
+		if (net_ratelimit())
+			netdev_err(lp->ndev, "Failed to get RX metadata pointer\n");
+		dev_kfree_skb_any(skb);
+		lp->ndev->stats.rx_dropped++;
+		goto rx_submit;
+	}
+
 	/* TODO: Derive app word index programmatically */
 	rx_len = (app_metadata[LEN_APP] & 0xFFFF);
 	skb_put(skb, rx_len);
@@ -1180,6 +1189,7 @@ static void axienet_dma_rx_cb(void *data, const struct dmaengine_result *result)
 	u64_stats_add(&lp->rx_bytes, rx_len);
 	u64_stats_update_end(&lp->rx_stat_sync);
 
+rx_submit:
 	for (i = 0; i < CIRC_SPACE(lp->rx_ring_head, lp->rx_ring_tail,
 				   RX_BUF_NUM_DEFAULT); i++)
 		axienet_rx_submit_desc(lp->ndev);
-- 
2.34.1