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Message-Id: <20210712061041.893919221@linuxfoundation.org>
Date: Mon, 12 Jul 2021 08:11:44 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 621/700] staging: gdm724x: check for overflow in gdm_lte_netif_rx()
From: Dan Carpenter <dan.carpenter@...cle.com>
[ Upstream commit 7002b526f4ff1f6da34356e67085caafa6be383a ]
This code assumes that "len" is at least 62 bytes, but we need a check
to prevent a read overflow.
Fixes: 61e121047645 ("staging: gdm7240: adding LTE USB driver")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Link: https://lore.kernel.org/r/YMcoTPsCYlhh2TQo@mwanda
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/staging/gdm724x/gdm_lte.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/staging/gdm724x/gdm_lte.c b/drivers/staging/gdm724x/gdm_lte.c
index a41af7aa74ec..bd5f87433404 100644
--- a/drivers/staging/gdm724x/gdm_lte.c
+++ b/drivers/staging/gdm724x/gdm_lte.c
@@ -611,10 +611,12 @@ static void gdm_lte_netif_rx(struct net_device *dev, char *buf,
* bytes (99,130,83,99 dec)
*/
} __packed;
- void *addr = buf + sizeof(struct iphdr) +
- sizeof(struct udphdr) +
- offsetof(struct dhcp_packet, chaddr);
- ether_addr_copy(nic->dest_mac_addr, addr);
+ int offset = sizeof(struct iphdr) +
+ sizeof(struct udphdr) +
+ offsetof(struct dhcp_packet, chaddr);
+ if (offset + ETH_ALEN > len)
+ return;
+ ether_addr_copy(nic->dest_mac_addr, buf + offset);
}
}
--
2.30.2
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