gve: add missing NULL check for gve_alloc_pending_packet() in TX DQO

[ Upstream commit 12c331b29c7397ac3b03584e12902990693bc248 ]

gve_alloc_pending_packet() can return NULL, but gve_tx_add_skb_dqo()
did not check for this case before dereferencing the returned pointer.

Add a missing NULL check to prevent a potential NULL pointer
dereference when allocation fails.

This improves robustness in low-memory scenarios.

Fixes: a57e5de476be ("gve: DQO: Add TX path")
Signed-off-by: Alok Tiwari <alok.a.tiwari@oracle.com>
Reviewed-by: Mina Almasry <almasrymina@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/google/gve/gve_tx_dqo.c b/drivers/net/ethernet/google/gve/gve_tx_dqo.c
index f879426cb5523a7e150f363b5e57b9d472b5817c..26053cc85d1c5225044f5ea8bfae4dcb025f61d8 100644 (file)
--- a/drivers/net/ethernet/google/gve/gve_tx_dqo.c
+++ b/drivers/net/ethernet/google/gve/gve_tx_dqo.c
@@ -770,6 +770,9 @@ static int gve_tx_add_skb_dqo(struct gve_tx_ring *tx,
        s16 completion_tag;
 
        pkt = gve_alloc_pending_packet(tx);
+       if (!pkt)
+               return -ENOMEM;
+
        pkt->skb = skb;
        completion_tag = pkt - tx->dqo.pending_packets;