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Message-Id: <20240213200900.41722-1-rand.sec96@gmail.com>
Date: Tue, 13 Feb 2024 23:09:00 +0300
From: Rand Deeb <rand.sec96@...il.com>
To: "David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: deeb.rand@...fident.ru,
lvc-project@...uxtesting.org,
voskresenski.stanislav@...fident.ru,
Rand Deeb <rand.sec96@...il.com>
Subject: [PATCH] dl2k: Fix potential NULL pointer dereference in receive_packet()
This patch addresses a potential NULL pointer dereference issue in the
receive_packet() function of the dl2k network driver. Previously, there was
a possibility of dereferencing a NULL pointer when the pointer 'skb'
returned from the function 'netdev_alloc_skb_ip_align()' was not checked
before being used. To resolve this issue, the patch introduces a check to
ensure that 'skb' is not NULL before dereferencing it.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Signed-off-by: Rand Deeb <rand.sec96@...il.com>
---
drivers/net/ethernet/dlink/dl2k.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/net/ethernet/dlink/dl2k.c b/drivers/net/ethernet/dlink/dl2k.c
index 734acb834c98..9cee510247e1 100644
--- a/drivers/net/ethernet/dlink/dl2k.c
+++ b/drivers/net/ethernet/dlink/dl2k.c
@@ -972,6 +972,14 @@ receive_packet (struct net_device *dev)
np->rx_buf_sz,
DMA_FROM_DEVICE);
}
+ if (skb == NULL) {
+ np->rx_ring[entry].fraginfo = 0;
+ printk (KERN_INFO
+ "%s: receive_packet: "
+ "Unable to re-allocate Rx skbuff.#%d\n",
+ dev->name, entry);
+ break;
+ }
skb->protocol = eth_type_trans (skb, dev);
#if 0
/* Checksum done by hw, but csum value unavailable. */
--
2.34.1
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