diff mbox series

[net-next,03/10] mptcp: pm: add a build check for userspace_pm_dump_addr

Message ID 20250221-net-next-mptcp-pm-misc-cleanup-3-v1-3-2b70ab1cee79@kernel.org (mailing list archive)
State New
Delegated to: Netdev Maintainers
Headers show
Series mptcp: pm: misc cleanups, part 3 | expand

Commit Message

Matthieu Baerts Feb. 21, 2025, 3:43 p.m. UTC 
From: Geliang Tang <tanggeliang@kylinos.cn>

This patch adds a build check for mptcp_userspace_pm_dump_addr() to make
sure there is enough space in 'cb->ctx' to store an address id bitmap.

Just in case info stored in 'cb->ctx' are increased later.

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
 net/mptcp/pm_userspace.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/net/mptcp/pm_userspace.c b/net/mptcp/pm_userspace.c
index 277cf092a87042a85623470237a8ef24d29e65e6..b69fb5b18130cb3abd08e3ef47004f599895486a 100644
--- a/net/mptcp/pm_userspace.c
+++ b/net/mptcp/pm_userspace.c
@@ -643,6 +643,8 @@  int mptcp_userspace_pm_dump_addr(struct sk_buff *msg,
 	struct sock *sk;
 	void *hdr;
 
+	BUILD_BUG_ON(sizeof(struct id_bitmap) > sizeof(cb->ctx));
+
 	bitmap = (struct id_bitmap *)cb->ctx;
 
 	msk = mptcp_userspace_pm_get_sock(info);