net: xilinx: axienet: Add error handling for RX metadata pointer retrieval

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>
Link: https://patch.msgid.link/20250903025213.3120181-1-abin.joseph@amd.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index 0d8a05fe541afb584ef9e3c5ee3dfbb5da27d70c..ec6d47dc984aa8a5013c222f6d559ecccc76e517 100644 (file)
--- 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);