linux-kernel - [PATCH] net: dev_addr_list: add address length validation in __hw_addr

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Message-ID: <CAO9wTFgtDGMxgE0QFu7CjhsMzqOm0ydV548j4ZjYz+SCgcRY3Q@mail.gmail.com>
Date: Mon, 17 Feb 2025 22:24:03 +0530
From: Suchit K <suchitkarunakaran@...il.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, 
	skhan@...uxfoundation.org, linux-kernel@...r.kernel.org, 
	linux-kernel-mentees@...ts.linux.dev, Suchit K <suchitkarunakaran@...il.com>
Subject: [PATCH] net: dev_addr_list: add address length validation in
 __hw_addr_insert function

Add validation checks for hardware address length in
__hw_addr_insert() to prevent problems with invalid lengths.

Signed-off-by: Suchit Karunakaran <suchitkarunakaran@...il.com>
---
 net/core/dev_addr_lists.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/core/dev_addr_lists.c b/net/core/dev_addr_lists.c
index 90716bd73..b6b906b2a 100644
--- a/net/core/dev_addr_lists.c
+++ b/net/core/dev_addr_lists.c
@@ -21,6 +21,9 @@
 static int __hw_addr_insert(struct netdev_hw_addr_list *list,
      struct netdev_hw_addr *new, int addr_len)
 {
+ if (!list || !new || addr_len <= 0 || addr_len > MAX_ADDR_LEN)
+ return -EINVAL;
+
  struct rb_node **ins_point = &list->tree.rb_node, *parent = NULL;
  struct netdev_hw_addr *ha;

-- 
2.48.1