[PATCH 6.1 101/217] gve: Clear napi->skb before dev_kfree_skb_any()

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6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ziwei Xiao <ziweixiao@xxxxxxxxxx>

commit 6f4d93b78ade0a4c2cafd587f7b429ce95abb02e upstream.

gve_rx_free_skb incorrectly leaves napi->skb referencing an skb after it
is freed with dev_kfree_skb_any(). This can result in a subsequent call
to napi_get_frags returning a dangling pointer.

Fix this by clearing napi->skb before the skb is freed.

Fixes: 9b8dd5e5ea48 ("gve: DQO: Add RX path")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Shailend Chand <shailend@xxxxxxxxxx>
Signed-off-by: Ziwei Xiao <ziweixiao@xxxxxxxxxx>
Reviewed-by: Harshitha Ramamurthy <hramamurthy@xxxxxxxxxx>
Reviewed-by: Shailend Chand <shailend@xxxxxxxxxx>
Reviewed-by: Praveen Kaligineedi <pkaligineedi@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240612001654.923887-1-ziweixiao@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/ethernet/google/gve/gve_rx_dqo.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

--- a/drivers/net/ethernet/google/gve/gve_rx_dqo.c
+++ b/drivers/net/ethernet/google/gve/gve_rx_dqo.c
@@ -465,11 +465,13 @@ static void gve_rx_skb_hash(struct sk_bu
 	skb_set_hash(skb, le32_to_cpu(compl_desc->hash), hash_type);
 }
 
-static void gve_rx_free_skb(struct gve_rx_ring *rx)
+static void gve_rx_free_skb(struct napi_struct *napi, struct gve_rx_ring *rx)
 {
 	if (!rx->ctx.skb_head)
 		return;
 
+	if (rx->ctx.skb_head == napi->skb)
+		napi->skb = NULL;
 	dev_kfree_skb_any(rx->ctx.skb_head);
 	rx->ctx.skb_head = NULL;
 	rx->ctx.skb_tail = NULL;
@@ -693,7 +695,7 @@ int gve_rx_poll_dqo(struct gve_notify_bl
 
 		err = gve_rx_dqo(napi, rx, compl_desc, rx->q_num);
 		if (err < 0) {
-			gve_rx_free_skb(rx);
+			gve_rx_free_skb(napi, rx);
 			u64_stats_update_begin(&rx->statss);
 			if (err == -ENOMEM)
 				rx->rx_skb_alloc_fail++;
@@ -736,7 +738,7 @@ int gve_rx_poll_dqo(struct gve_notify_bl
 
 		/* gve_rx_complete_skb() will consume skb if successful */
 		if (gve_rx_complete_skb(rx, napi, compl_desc, feat) != 0) {
-			gve_rx_free_skb(rx);
+			gve_rx_free_skb(napi, rx);
 			u64_stats_update_begin(&rx->statss);
 			rx->rx_desc_err_dropped_pkt++;
 			u64_stats_update_end(&rx->statss);






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