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Message-ID: <20240322195744.9050-1-amishin@t-argos.ru>
Date: Fri, 22 Mar 2024 22:57:44 +0300
From: Aleksandr Mishin <amishin@...rgos.ru>
To: "David S. Miller" <davem@...emloft.net>
CC: Aleksandr Mishin <amishin@...rgos.ru>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Kees Cook
<keescook@...omium.org>, Justin Stitt <justinstitt@...gle.com>, Felix
Manlunas <felix.manlunas@...ium.com>, Satanand Burla
<satananda.burla@...ium.com>, Raghu Vatsavayi <raghu.vatsavayi@...ium.com>,
Vijaya Mohan Guvva <vijaya.guvva@...ium.com>, <netdev@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <lvc-project@...uxtesting.org>
Subject: [PATCH net v2] liquidio: Fix potential null pointer dereference
In lio_vf_rep_copy_packet() pg_info->page is compared to a NULL value,
but then it is unconditionally passed to skb_add_rx_frag() which could
lead to null pointer dereference.
Fix this bug by moving skb_add_rx_frag() into conditional scope.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: 1f233f327913 ("liquidio: switchdev support for LiquidIO NIC")
Signed-off-by: Aleksandr Mishin <amishin@...rgos.ru>
---
v2: Fix incorrect 'Fixes' tag format
drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c b/drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c
index aa6c0dfb6f1c..e26b4ed33dc8 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c
@@ -272,13 +272,12 @@ lio_vf_rep_copy_packet(struct octeon_device *oct,
pg_info->page_offset;
memcpy(skb->data, va, MIN_SKB_SIZE);
skb_put(skb, MIN_SKB_SIZE);
+ skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
+ pg_info->page,
+ pg_info->page_offset + MIN_SKB_SIZE,
+ len - MIN_SKB_SIZE,
+ LIO_RXBUFFER_SZ);
}
-
- skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
- pg_info->page,
- pg_info->page_offset + MIN_SKB_SIZE,
- len - MIN_SKB_SIZE,
- LIO_RXBUFFER_SZ);
} else {
struct octeon_skb_page_info *pg_info =
((struct octeon_skb_page_info *)(skb->cb));
--
2.30.2
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