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 0d8a05f..ec6d47d 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);
