There is an error check inside emac_xmit_xdp_frame() function which
is called when the driver wants to transmit XDP frame, to check if
the allocated tx descriptor is NULL, if true to exit and return
ICSSG_XDP_CONSUMED implying failure in transmission.
In this case trying to free a descriptor which is NULL will result
in kernel crash due to NULL pointer dereference. Fix this error handling
and increase netdev tx_dropped stats in the caller of this function
if the function returns ICSSG_XDP_CONSUMED.
Fixes: 62aa3246f462 ("net: ti: icssg-prueth: Add XDP support")
Signed-off-by: Meghana Malladi <m-malladi@xxxxxx>
---
drivers/net/ethernet/ti/icssg/icssg_common.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/ti/icssg/icssg_common.c b/drivers/net/ethernet/ti/icssg/icssg_common.c
index afa01c22dee8..f0224576b95f 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_common.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_common.c
@@ -584,7 +584,7 @@ u32 emac_xmit_xdp_frame(struct prueth_emac *emac,
first_desc = k3_cppi_desc_pool_alloc(tx_chn->desc_pool);
if (!first_desc) {
netdev_dbg(ndev, "xdp tx: failed to allocate descriptor\n");
- goto drop_free_descs; /* drop */
+ return ICSSG_XDP_CONSUMED; /* drop */
}
if (page) { /* already DMA mapped by page_pool */
@@ -672,8 +672,10 @@ static u32 emac_run_xdp(struct prueth_emac *emac, struct xdp_buff *xdp,
q_idx = smp_processor_id() % emac->tx_ch_num;
result = emac_xmit_xdp_frame(emac, xdpf, page, q_idx);
- if (result == ICSSG_XDP_CONSUMED)
+ if (result == ICSSG_XDP_CONSUMED) {
+ ndev->stats.tx_dropped++;
goto drop;
+ }
dev_sw_netstats_rx_add(ndev, xdpf->len);
return result;
--
2.43.0
