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Subject[PATCH] liquidio: avoid NULL pointer dereference in lio_vf_rep_copy_packet()
Date
lio_vf_rep_copy_packet() passes pg_info->page to skb_add_rx_frag()
that dereferences it without any check. So, it does not make sense
to call skb_add_rx_frag() when pg_info->page is NULL to avoid an segfault.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Aleksandr Burakov <a.burakov@rosalinux.ru>
Fixes: 1f233f327913 ("liquidio: switchdev support for LiquidIO NIC")
---
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 600de587d7a9..e70b9ccca380 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));
--
2.25.1
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