[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <20250314003404.16408-1-pwn9uin@gmail.com>
Date: Fri, 14 Mar 2025 00:34:04 +0000
From: pwn9uin@...il.com
To: "David S . Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>,
netdev@...r.kernel.org,
Minjoong Kim <alswnd4123@...look.kr>
Subject: [PATCH net] atm: null pointer dereference when both entry and holding_time are NULL.
From: Minjoong Kim <alswnd4123@...look.kr>
When MPOA_cache_impos_rcvd() receives the msg, it can trigger
Null Pointer Dereference Vulnerability if both entry and
holding_time are NULL. Because there is only for the situation
where entry is NULL and holding_time exists, it can be passed
when both entry and holding_time are NULL. If these are NULL,
the entry will be passd to eg_cache_put() as parameter and
it is referenced by entry->use code in it.
Signed-off-by: Minjoong Kim <alswnd4123@...look.kr>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
---
net/atm/mpc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/atm/mpc.c b/net/atm/mpc.c
index 324e3ab96bb3..7fb854ea47dc 100644
--- a/net/atm/mpc.c
+++ b/net/atm/mpc.c
@@ -1314,6 +1314,9 @@ static void MPOA_cache_impos_rcvd(struct k_message *msg,
holding_time = msg->content.eg_info.holding_time;
dprintk("(%s) entry = %p, holding_time = %u\n",
mpc->dev->name, entry, holding_time);
+ if (entry == NULL && !holding_time) {
+ return;
+ }
if (entry == NULL && holding_time) {
entry = mpc->eg_ops->add_entry(msg, mpc);
mpc->eg_ops->put(entry);
--
2.34.1
Powered by blists - more mailing lists