netdev - [PATCH iwl-next v4] ixgbe: Fix possible skb NULL pointer dereference

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Message-ID: <20250131121450.11645-1-piotr.kwapulinski@intel.com>
Date: Fri, 31 Jan 2025 13:14:50 +0100
From: Piotr Kwapulinski <piotr.kwapulinski@...el.com>
To: intel-wired-lan@...ts.osuosl.org
Cc: netdev@...r.kernel.org,
	dan.carpenter@...aro.org,
	yuehaibing@...wei.com,
	maciej.fijalkowski@...el.com,
	przemyslaw.kitszel@...el.com,
	Piotr Kwapulinski <piotr.kwapulinski@...el.com>
Subject: [PATCH iwl-next v4] ixgbe: Fix possible skb NULL pointer dereference

The commit c824125cbb18 ("ixgbe: Fix passing 0 to ERR_PTR in
ixgbe_run_xdp()") stopped utilizing the ERR-like macros for xdp status
encoding. Propagate this logic to the ixgbe_put_rx_buffer().

The commit also relaxed the skb NULL pointer check - caught by Smatch.
Restore this check.

Fixes: c824125cbb18 ("ixgbe: Fix passing 0 to ERR_PTR in ixgbe_run_xdp()")
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Acked-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Signed-off-by: Piotr Kwapulinski <piotr.kwapulinski@...el.com>
---
v1 -> v2
  Provide extra details in commit message for motivation of this patch
v2 -> v3
  Simplify the check condition
v3 -> v4
  Rebase to net-queue
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 7236f20..467f812 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -2105,7 +2105,7 @@ static void ixgbe_put_rx_buffer(struct ixgbe_ring *rx_ring,
 		/* hand second half of page back to the ring */
 		ixgbe_reuse_rx_page(rx_ring, rx_buffer);
 	} else {
-		if (!IS_ERR(skb) && IXGBE_CB(skb)->dma == rx_buffer->dma) {
+		if (skb && IXGBE_CB(skb)->dma == rx_buffer->dma) {
 			/* the page has been released from the ring */
 			IXGBE_CB(skb)->page_released = true;
 		} else {
-- 
2.43.0