netdev - [PATCH v1 net 0/3] udp: Fix two integer overflows when sk->sk_rcvbuf is close to INT

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Message-ID: <20250323231016.74813-1-kuniyu@amazon.com>
Date: Sun, 23 Mar 2025 16:09:49 -0700
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: Willem de Bruijn <willemdebruijn.kernel@...il.com>, "David S. Miller"
	<davem@...emloft.net>, David Ahern <dsahern@...nel.org>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>
CC: Simon Horman <horms@...nel.org>, Kuniyuki Iwashima <kuniyu@...zon.com>,
	Kuniyuki Iwashima <kuni1840@...il.com>, <netdev@...r.kernel.org>
Subject: [PATCH v1 net 0/3] udp: Fix two integer overflows when sk->sk_rcvbuf is close to INT_MAX.

I got a report that UDP mem usage in /proc/net/sockstat did not
drop even after an application was terminated.

The issue could happen if sk->sk_rmem_alloc wraps around due
to a large sk->sk_rcvbuf, which was INT_MAX in our case.

The patch 2 fixes the issue, and the patch 1 fixes yet another
overflow I found while investigating the issue.

Kuniyuki Iwashima (3):
  udp: Fix multiple wraparounds of sk->sk_rmem_alloc.
  udp: Fix memory accounting leak.
  selftest: net: Check wraparounds for sk->sk_rmem_alloc.

 net/ipv4/udp.c                          |  18 ++-
 tools/testing/selftests/net/.gitignore  |   1 +
 tools/testing/selftests/net/Makefile    |   2 +-
 tools/testing/selftests/net/so_rcvbuf.c | 178 ++++++++++++++++++++++++
 4 files changed, 188 insertions(+), 11 deletions(-)
 create mode 100644 tools/testing/selftests/net/so_rcvbuf.c

-- 
2.48.1